CHANGELOG.md

## V 0.5.0
*31 Dec 2025*

#### Improvements in the language
- Add comptime `if is shared` support (fix #25600) (#25602)
- Make `defer{}` scoped by default, use `defer(fn){}` to get the old behavior #25639) (#25665)
- Add gotodef support for nested struct members, fn return types, etc (#26131)
- Add a new v.comptime stage `COMPTIME`, that runs after the checker (`CHECK`), and before the transformer (`TRANSFORM`), to simplify the work that later stages do #26068 (#26161)

#### Checker improvements/fixes
- Correctly detect variadic arg passed to struct fn (fix #25504) (#25509)
- Fix $(field.name) access on closure fn (fix #25513) (#25514)
- vls: skip unrelated files (#25531)
- Fix mutability in `for in` loops with pointer values (fix #25520) (#25536)
- Fix type inference, when pushing an empty array to a 2D array (fix #23854) (#25508)
- Prevent array.insert for array of references when non-reference is passed (fix #25511) (#25557)
- Add more support for mod autocomplete, allow for .vv files too (#25562)
- Fix cast from an empty struct to option (fix #25566) (#25581)
- Ensure ?Struct is not parsed as ??Struct when param is ?T (fix #25559) (#25564)
- Fix if branch type nr_muls mismatch (fix #25556) (fix #25555) (#25571)
- Fix comptime else branch handling (fix #25586) (#25589)
- Smart detect `or {}` inside loop when using `c <-val` (fix #24550) (#25435)
- Vls fix goto definition (#25595)
- Fix generic resolve for external module generic static method call (fix #21476) (#25634)
- Correctly detect type, when prepending to generic array (fix #25585) (#25645)
- Allow cast from voidptr to sumtype in unsafe block (fix #25652) (#25657)
- Disallow calls to a shared receiver method, on a non-shared var (fix #25577) (#25656)
- Fix or block endwiths expr (fix #25329) (#25667)
- Set ast file fallbacks for vls (fix #25678) (#25679)
- Error/warn when using `defer(fn)` inside function-scope and `lock` stmts (#25681)
- Maintain correct ref level in generic fn (fix #25676) (#25687)
- In vls mode, make ensure_type_exists return true (#25695)
- Only collect/hoist inner vars, when `defer` is function-scoped (#25693)
- Improve type checking for sumtypes with generics (fix #25690) (#25699)
- Unwrap for base type if ft.typ and inferred_typ are both opt (fix #25517) (#25728)
- Disallow deference of nil (fix #25740) (#25746)
- Fix comptime main fn (#25747)
- Parser,fmt,checker: use a trie for matching the generic array methods `all`, `any`, `count`, `filter`, `map`, `sort` and `sorted` (#25759)
- Fix array fixed unresolved return check and resolver (fix #25774) (#25790)
- Allow explicit sumtype to option casts (fix #25796) (#25812)
- Fix possible race on expected arg types unwrapping on cgen (#25815)
- Skip init check for options (fix #25798) (#25830)
- Fix module var set at change_current_file() (fix #25845) (#25846)
- Improve handling of array decompose for dynamic arrays and array init (fix #25838) (#25843)
- Force all fn declarations to follow after all other top level statements (fix #25889) (#25890)
- Fix used features tracking when printing pointer values (fix #25899) (#25901)
- Match type when auto deref occurs (fix #25913) (#25916)
- Relax the redundant () check to a notice, to enable a future `v -W test vlib/builtin` job on the CI
-  remove () from match branch exprs (fix #25950) (#25952)
- Fix array map anon fn return fixed array (fix #25928) (#25977)
- Cleanup the output of `v new --web abcd` after feedback from https://youtu.be/IuE6Bo1klK0?t=555
- Allow assign to a shared int var (fix #25986) (#25988)
- Ensure type of global exists (fix #25910) (#25998)
- Ensure fn pointer cannot be used as non-fn argument (fix #26017) (#26022)
- Make sure  `$for` eval body statements at least once to set types and avoid markused issues later (fix #26058) (#26063)
- Fix return static method name (fix #26105) (#26110)
- Support gotodef for struct init and sumtype rhs (#26157)
- Detect circular type references in sumtype declarations (fix #24511) (#26162)
- Add interface type handling and new testcase (fix #24116) (#26165)
- Allow enum fields to reference previously declared fields (fix #25241) (#26173)
- Clear all ref from autostr receiver_type (needed by #25857) (#26202)
- Allow for `_` being used as both `import x as _` and `fn f(_ int) {` (fix (#26219) #26230

#### Parser improvements
- Fix vls mode strut mut keyword (fix #25548) (#25551)
- Fix vfmt comment in struct init after the update expr (fix #24361) (#25668)
- Fix infix expr comment in middle (fix #24183) (#25671)
- Disallow using generic functions as a field type name inside struct decl (fix #25452) (#25705)
- Warn on `@[deprecated_after]` used without a corresponding `@[deprecated]` attribute (#25712)
- Fix last stmt is fn call in or_expr (fix #25732) (#25739)
- Allow for `|mut x, y|expr` (fix #25734) (#25735)
- Allow using `a`, `b` and `it` as var names, when using the builtin array methods (fix #25729) (#25755)
- Disallow generic function to be exported (fix #25794) (#25806)
- Support `-d trace_parse` to ease diagnosing problems related to the order of parsing of .v files in modules
- Fix the language support for a nested anonymous C.struct (fix #25807) (#25789)
- Disallow untyped `chan` used as a fn parameter type (fix #25818) (#25854)
- Improve the unused import warning message (add fixing alternatives) (#25880)
- checker,parser,ast: make `type MyBuilder = strings.Builder` work (part 1); add `mod` fields to ast.SumTypeDecl and ast.AliasTypeDecl (#25943)
- Remove dead code in Parser.is_array_type/0 (#26080)
- Check invalid struct name in struct_init() (fix #26030) (#26093)
- Remove the support for the obsolete generic fn call syntax f<T>() (first deprecated in 2022/11) (#26126)
- Fix comptime for lock shared field (fix #26143) (#26146)
- checker,parser: add multifile gotodef support for -line-info (#26167)
- Optmize Parser.call_kind (#26196)

#### Compiler internals
- markused: fix markused struct heap (#25542)
- markused: fix array.prepend C code dependency (fix #25573) (#25582)
- markused: fix fn marked as used when variable and fn uses same name (fix #25649) (#25650)
- checker,transformer: add always true/false branch detection for the `if` and `match` constructs (#25674)
- v.util: measure more precisely how long a new tool recompilation lasts in launch_tool, when using `v -d trace_launch_tool self`
- transformer: fix struct init comparison turning into boolean (#25724)
- v.builder: support V_NO_RM_CLEANUP_FILES=1, to ease debugging of -usecache issues
- v.builder: make it easier to reproduce the exact specific stages of -usecache module compilation by logging the full CLI options for each
- v.builder: fix `.vsh` mode doing an implicit `import os`, now only for .vsh file itself (fix issue spotted in #25736) (#25745)
- v.builder: improve diagnostic information for a failed build_thirdparty_obj_file
- transformer: transform ArrayInit into a function call for C and native backends (part 1)
- builder,pref: add  `-file-list` support (implement feature #25707) (#25749)
- pref: for -usecache, set .parallel_cc = false and .no_parallel = true to make compilations more deterministic and ease CI diagnostics
- markused: fix missing builtin__memdup definition, when an option struct field is used (fix #25801) (#25802)
- transformer: move array logic to array.v
- v.builder: improve the error message for failing cgen; suggest `-g` and `-show-c-output`
- v.pref: fix GitHub download URL for the photonwrapper .so file (fix #25708) (#25831)
- v.pref: use `v download` for downloading the prebuilt `photonwrapper` shared library (#25849)
- markused: fix const as fn mark as used (fix #25888) (#25895)
- transformer: disable generic str_intp opt (fix #25896) (#25897)
- v.scanner: remove obsolete .is_crlf and .is_vh fields (#25918)
- v.scanner: use a named return for decode_XXX_escape_single methods, to reduce the generated C diff churn, during scanner code updates
- markused: add new auto_str() used funcs for bootstrap (#25938)
- v.builder: provide more detailed error message, on `msvc: failed to build a thirdparty object`, not just the failed command
- v.builder: improve formatting of the `failed to build a thirdparty object` message for msvc
- scanner: remove old generic check logic (fix #25959) (#25997)
- transformer: fix the setting of a generic flag for fixed array type with `-new-transformer` (#26009)
- transformer: add file/line info for fn with `expand_simple_interpolation` (#26135)
- transformer: add early return to avoid transform getting applied twice for a `for x < y {` body (#26153)
- markused: fix option none markused (fix #26147) (#26151)
- v.builder: enable gc back with msvc, build separate `.debug.obj` thirdparty files when -g is passed, to prevent linking issues (#26215)
- v.builder: support compiling asm .S files to .o files, mentioned in #flag directives (needed for #26185) (#26211)
- v.builder: fix compile asm file, followup of PR #26211 (#26227)

#### Standard library
- arrays: fix rotate_left() and rotate_right(), add test (#25539)
- encoding.base58: fix encoding, add test (#25538)
- x.crypto.chacha20poly1305: move up responsibility for allocs into higher caller (#25574)
- crypto.cipher: fix decryption in CBC mode, add test (#25584)
- os: use `@[noinline]` on os.create/1 to workaround a `-cc gcc -prod` panic (fix #25549)
- time: fix non-digit checks for parse_rfc3339() (#25597)
- gg: add explicit bounds checking for image caching methods in gg (fix #25590) (#25591)
- time: fix quarter calculation in custom_format() (#25608)
- rand: fix randomness in shuffle() (#25617)
- gg: destroy unused GPU resources before replacing cached images (#25615)
- encoding.binary: fix serialize skip struct shared fields (related to issue #25600) (#25613)
- x.crypto.chacha20poly1305: make implementation use fixed sized arrays more (#25627)
- builtin: make result string end with null in `u8(x).repeat(y)` (fix regression after #22100) (#25625)
- gg: fix address of const warnings for `v -experimental program_using_gg.v`
- builtin: add .hex() methods to the `rune` and `char` types too (#25635)
- datatypes: fix insert() and delete() for items in second half of DoubleLinkedList[T]{}, add test (#25647)
- builtin: use an explicit loop to determine min_common_indent in string.trim_indent/0 to reduce allocations and reduce the reasons for misfires of the closure detection heuristic
- vlib: use `defer(fn) {` syntax where appropriate (part 2 of #25639) (#25653)
- x.json2: fix decode_number not initializing value to zero (fix #25641) (#25675)
- crypto.hmac: optimize hmac.new, support calculations with a blocksize > 256 (#25686)
- math.unsigned: fix put_bytes(), add test (#25718)
- builtin: reset .len and .cap to 0 too, in the array.free() method (#25717)
- os: add pipe and stdio_capture support (implement #25714) (#25716)
- encoding.utf8.validate: fix validation, add test (#25748)
- crypto.blake2b,crypto.blake2s: add `@[direct_array_access]` to hot functions (#25750)
- strconv: fix handling of subnormal numbers like `'1.23e-308'.f64()` (fix #25751) (#25752)
- crypto.sha3: remove `import math` (just for int_max), to improve compilation time and complexity for code that uses sha3
- builtin: add declarations for C.GetCurrentThreadId(), C.gettid() and C.pthread_self()
- builtin: add pid: and tid: fields to the panic reports (part 2 of #25808) (#25809)
- gg: add doc comments for the FN** types (#25814)
- rand: add missing i8() utility function (#25819)
- builtin: fix C.SYSTEM_INFO (fix #25788) (#25823)
- builtin: support `-d no_getpid` and `-d no_gettid` for systems that lack proper process management APIs
- math: fix vec2,3,4 project not using the right formulas (fix #25811) (#25813)
- math.vec: swap u and v in the .project() method of Vec2,Vec3,Vec4 (#25841)
- crypto.cipher: fix xor_key_stream() for OFB mode, add test (#25844)
- encoding.binary: use unions for small speed increase and readability (#25867)
- math.complex: replace `==` with eq_epsilon() in equals() (#25873)
- crypto.cipher: fix xor_key_stream() for CTR mode, add test vector created with OpenSSL (#25866)
- os: enhance os.cp() to mimic Python's shutil.copy2() (#25893)
- io.util: use correct TempDirOptions parameter type name in temp_dir() (#25904)
- builtin,sync: eliminate calls to _us32_lt in new_map/6, and in the spinloops in Channel.try_push_priv, Channel.try_pop (#25912)
- rand: restore error margin in dist_test.v back to 0.05 (the updated seeds were found by @tankf33er in #25907)
- builtin: reduce the max size of string representations of integers (#25919)
- builtin: remove commented code, improve comments
- x.crypto.chacha20: fix deprecation warning during compilation of Cipher.rekey/2
- math.easing: fix in_out_expo(), add test (#25944)
- builtin: split builtin.v and builtin.c.v into smaller, and more focused .v files, to ease working on unrelated subsystems (#25965)
- transformer: fix `v -new-transformer vlib/strconv/atoi_test.v` (#26021)
- gg: add more documentation for color substraction (fix #21549) (#26023)
- toml: fix for single `\r` occurence in multi-line `"""` strings (`\r\n` is still allowed) (#26029)
- toml: remove workarounds + `TODO`s for fixed issue #9507 (#26037)
- x.json2: fix decode_number for u8 (fix #26027) (#26033)
- rand.wyrand: switch to using the original C._wymix() as a performance optimisation (#26051)
- strconv: fix float scientific notation (fix #26045) (#26046)
- x.json2: fix decoding of float values in scientific notation (fix #26043) (fix #26062) (#26060)
- builtin: add a declaration for C.memchr too (#26054)
- toml: add compliance up until official toml-lang/toml-test@c6a78f1 (#26067)
- builtin: fix some C fn parameter types (#26069)
- toml: add compliance to official toml-lang/toml-test@8bb8d9c (#26070)
- toml: remove special cases for `jq` normalization (#26092)
- toml: fix remaining valid `key/*` exceptions (#26125)
- builtin: make string.index_ public, to simplify code using a redundant `x := s.index(sub) or { -1 }` pattern (#26123)
- builtin: add declarations for C.memmem and C.mempcpy (#26129)
- builtin: speed up, fix and test impl_utf8_to_utf32 (#26109)
- toml: fix remaining valid `array/*` exception (#26138)
- toml: fix unicode decoding panic on invalid TOML `key/duplicate-keys-06.toml` (#26140)
- toml: allow `true` and `false` as keys when parsing root table (#26144)
- toml: allow dotted key lengths > 2 within nested arrays of arrays (#26145)
- flag: fix `v vet -W vlib/flag/` (fix remaining doc comments)
- x.json2: fix memory access error, when decoding string enum values (fix #26176) (fix #26179) (#26178)
- toml: fix invalid exception by erroring on duplicate keys in inline table (#26177)
- time: implement faster and simpler `push_http_header` (#26155)
- toml: fix remaining invalid exceptions for `table/*` (#26189)
- toml: reach 100% TOML v1.0.0 compliance with the official test suite (#26203)
- x.json2: remove workaround_cast(), add isize usize decode support (#26210)

#### Web
- net: fix cookie parsing when `;` is used (fix #25544) (#25561)
- veb: new fasthttp module with -d new_veb (multithreaded, epoll/kqueue): makes veb multithreaded and fixes frequent hangs
- veb: fix gzip middleware decode/encode (fix #20865) (fix #25753) (#25754)
- veb: gzip support for StaticHandler (fix #20859) (#25758)
- veb: support markdown content negotiation, compliant with https://llmstxt.org/ (#25782)
- fasthttp: move kqueue related code to a separate file
- veb: add zstd compression support (#25816)
- veb: remove println('send_file ct=...') leftover (#25834)
- ci: reduce false positives for veb_should_listen_on_both_ipv4_and_ipv6_by_default_test.v by retrying it 3 times (since sometimes binding to the port it listens to fails)
- veb: add an early startup panic error message, when the result type of route handler methods *is not* `veb.Result` (fix #25970) (#25973)
- net.mbedtls: make errors more verbose, to ease remote diagnosis of issues
- net.openssl: make errors more verbose, to ease remote diagnosis of issues
- veb: improve the before_request documentation
- veb: add method.location too, to the invalid return type error, to ease diagnosing problems while prototyping
- wasm: fix const reference another const (fix #25722) (#26010)
- fasthttp: fixes and improvements (#25906)
- wasm: export pub fns in main module when targeting wasi (#26041)
- net.http: use error_with_code in download_file() (fix #26056) (#26057)
- net.http,veb: fix detection of the headers/body boundary in parse_request_head_str (fix #26091) (#26112)
- fasthttp: expand http request parser (related to #26091 part1) (#26104)
- net.ftp: fix get() command conversation, add test (fix #18858) (#26194)
- x.sessions: verify HMAC signatures when extracting sessions IDs from cookies (#26199)
- net.http: fix a panic in parse_multipart_form, for small/incomplete form data (fix #26204)
- net.http: support keep-alive connections in server (fix #26136) (#26218)

#### ORM
- Mark orm_where_in_test.v to be skipped in the sanitize-memory-clang job
- Fix fkey insert as assigment expr (fix #25568) (#25575)
- Fix double fkey insert and update (fix #25593) (#25606)
- Add index attr support (#25604)
- Fix autofree detection for is_or with block style (fix #25969) (#26089)
- Allow multiple set() in one update() call (fix #26116) (#26117)
- Add check for invalid index field name (#26142)
- Supoprt DISTINCT keyword (#26163)

#### Database drivers
- db.sqlite: fix orm f32 field retrieval for sqlite (fix #25583) (#25592)
- db.pg: support returning `Result` type with column names (#25737)
- db.sqlite: allow for `mut db := sqlite.connect_full(":memory:", [.readwrite, .create, .fullmutex], "")!` defaulting to unix/win32 depending on the platform
- db.pg: support LISTEN/NOTIFY (implement feature #23983) (#26133)
- db.pg: fix `v check-md vlib/db/pg/README.md`
- Revert "db.sqlite: support calling exec_param_many with [][]string or []string (it now accepts a sumtype of both) (#26100)"
- Reapply "db.sqlite: support calling exec_param_many with [][]string or []string (it now accepts a sumtype of both) (#26100)"

#### Native backend
- Fixed array, `-new-transformer` dynamic array (#25817)
- Add `$if trace_native_todos ? {` to reduce noise in `v test-all`

#### C backend
- Fix resolution type Map[string]T  when T is AliasToMap (fix #25494) (#25510)
- Fix markused for option generic param (fix #25501) (#25525)
- Fix empty struct initializer for clang (fix #25467) (#25526)
- Fix match codegen for option match case (fix #25533) (#25537)
- Fix codegen for alias for array fixed initialization (fix #25512) (#25540)
- Ensure option none/ok state is also compared (#25532)
- Fix match codegen for option expr on case (fix #25545) (#25553)
- Add `-no-closures` option to detect closure usage earlier (for emscripten or for less well supported platforms) (#25565)
- Create ctemp before lockexpr gen (fix #25576) (#25612)
- Fix if expr with condition that requires temporary variable (fix #19584) (fix #23903) (#25621)
- Fix multi return of a fixed array (fix #25626) (#25628)
- Fix generic multiple indirections on print (fix #22793) (#25633)
- Fix `fn (d Struct) a[T]() T { return d }` when T is a sumtype (#25644)
- Minimize code generated for asserts (generate the common parts for the pass/fail case once) (#25642)
- Handle pointers in json map decode/encode (fix #25632) (#25646)
- Fix `defer` stmts with `if` exprs and `or` blocks that return a value (#25651)
- Fix infix expr ComptimeSelector type (fix #25659) (#25662)
- Fix passing sumtype child to generic function taking sumtype parent (fix #25660) (#25664)
- Fix multi generics fn name (fix #23886) (#25673)
- Fix `defer` generation within comptime `$if`/`$match`/`$for` (#25677)
- Fix codegen for if comptime and array fixed (fix #25691) (#25697)
- Correct function definitions for callbacks in imported modules (fix #25700) (#25719)
- Improve codegen for array fixed init for g++ compiler (fix #25723) (#25725)
- Fix codegen for operator overload method_name on alias to builtin types (fix #25709) (#25726)
- Fix missing cast if fixed array is surrounded in brackets (fix #25629) (#25741)
- Fix comptime for types not being recognized with maps correctly (fix #25742) (#25743)
- Fix dump(ptr_to_fixed_array_value) - it now returns the argument directly (thanks @tankf33der) (#25764)
- Cast member variables to correct types in comptime $for (fix #25771) (#25773)
- Include `ast.ComptimeSelector` in fixed array checks (fix #25767) (#25777)
- Checker,cgen,type_resolver: prevent stale type cast on comptime `$for`, handle in dumpexpr (fix #25781) (#25784)
- Reduce the nested expr level complexity of Gen.ident
- Fix tcc __attribute__, fix os.notify (followup to #25779) (#25804)
- Ensure array of string is not cloned with depth 0 (fix #25783) (#25793)
- Support `-d trace_check` and `-d trace_cgen` to help diagnose checker and cgen ordering issues
- Support `-d trace_cgen_fn_decl` and `-d trace_cgen_gen_fn_decl` too
- Show the v_gettid() hex with `-d trace_cgen_fn_decl` and `-d trace_cgen_gen_fn_decl`
- Use variadic_count == 1 when passing variadic to call of same array type (fix #25827) (#25837)
- Fix nested or in assign decl (fix #25864) (#25865)
- Fix variadic on translated (fix #25862) (#25876)
- Allow @[cinit] for const variables (#25881)
- Fallback to field type when default_expr_typ is 0 (fix #25891) (#25903)
- Fix map value init with array fixed const (fix #25887) (#25902)
- Fix cast type changed before last stmt in `stmts_with_tmp_var` (#25915)
- Update wyhash to version 4.2 (#25907)
- Use final_sym for elem_sym in index_of_array (fix #25960) (#25961)
- Fix variadic call on sumtype with array of itself (fix #25898) (#25964)
- Correct T{} init for []Type aliases (fix #25962) (#25963)
- Fix array init with fixed array from return call (fix #25954) (#25971)
- Fix fntype unwrap on ifguard (fix #25911) (#25914)
- Add a source .location field to `$for method in Type.methods {` (#25976)
- Fix iterator on alias to fn ptr (fix #25911) (#25978)
- Fix shared int string intp (fix #25984) (#25989)
- Allow init shared field with default value (fix #25990) (#25991)
- Allow init of struct from struct with array of optional values (fix #26000) (#26005)
- Fix default value in if/else or block (fix #26002) (#26020)
- Fix fnptr indirections declaration (fix #25940) (#25987)
- Fix bool cast from value (fix #26028) (#26031)
- Fix cast() generic type bug (fix #26065) (#26066)
- Fix fn_var_signature() support nr_muls (fix #26049) (#26075)
- Fix cast_expr() for alias (fix #26076) (#26079)
- Handle CallExpr in dumpexpr (fix #26084) (#26087)
- Clean code in return stmt (fix #25968) (#26118)
- Fix cast to array (fix #26099) (#26102)
- Fix fn_var_signature() allow option type (fix #26088) (#26120)
- Fix scoped struct array fixed generation (fix #26111) (#26114)
- Fix option array init with non option values (fix #26148) (#26170)
- Fix heap fixed array assign (fix #26149) (#26169)
- Fix stack overflow for `@[heap]` structs with large fixed arrays (fix #22690) (#26183)
- Fix print interface when arg0 is function call (fix #26184) (#26188)
- Checker,table,cgen: fix generic interface confusion (fix #25478) (#26181)

#### vfmt
- Force conversion of []Type{init: it} -> []Type{init: index} (#26201)

#### Tools
- ci: run `v doc` with VJOBS=1 on the CI, to make remote diagnosing of failures easier
- Remove unused `sw := time.new_stopwatch()` call
- Add support for VTEST_SHOW_CMD=1 in `v test .` too
- ci: use VJOBS=1 for the `v test cmd/tools/vdoc` step too, to ease diagnosing remote CI failures
- ci: bump cross-platform-actions/action from 0.29.0 to 0.30.0 (#25666)
- Fix showing the *failed* compilation output with `v -silent test .`
- ci: bump all `timeout-minutes: 15` to `timeout-minutes: 20` to reduce false positives due to network timeouts (mostly for the Termux job)
- Note about `v help check-md` when `v check-md .` fails
- ci: skip invalid_utf8_string.vv in compiler_errors_test.v for msvc
- ci: reduce annotation noise, remove dead code
- ci: skip the multistage v->v2->v3 -usecache checks for now (reduce false positives on the CI for unrelated PRs, until the root cause is fixed)
- ci: add new job `sanitize-address-clang-without-gc` that passes `-gc none` through VFLAGS (#25780)
- Support `VTEST_SHOW_LONGEST_BY_RUNTIME=5 VTEST_SHOW_LONGEST_BY_COMPTIME=5 VTEST_SHOW_LONGEST_BY_TOTALTIME=5 v test .`
- Print total time at the *end* of the `v test-all` output to ease visual comparisons in separate shells, without scrolling
- Use unbuffer_stdout in TestSession.test, to ensure consistent output on the CI jobs
- v.builder: remove the obsolete check for V_NO_C_ERROR_INFO (VQUIET=1 replaced it in 2023); add VQUIET to the `-q` description
- Make `v search` failures easier to diagnose (on the CI)
- Support `v download -o some/folder/local.toml TOML_URL`, in addition to --target-folder
- Add `--sha3-256` support for checksumming the content that `v download` saves
- Add a watchdog timer in test_if_v_test_system_works.v to speedup the failure of stuck CI jobs
- Use local `vtest build:` tags to eliminate the need for the skip_fsanitize_too_slow list in vtest-self.v
- ci,vpm: make dependency_test.v more robust, and easier to diagnose remotely
- ci: set VTMP too in set_test_env/1, to avoid cloning conflicts during parallel test executions
- v.builder: do not produce `If the code is in a folder with multiple .v files` for temp V REPL files, to improve messages for `'asdas'.starts_wiz('xyz')`
- Add a `-new-transformer` task to `v test-all`. Remove `-skip-unused` flags (it is the default for ~1 year).
- Improve development experience for `v -W -silent test-self vlib` (especially on CIs); *always* show compilation errors for failures
- Support `VTEST_KEEP_SESSION=1 ./v test vlib/math`
- vet: use new annotation syntax ([] -> @[]) (#26026)
- ci: bump cross-platform-actions/action from 0.31.0 to 0.32.0 (#26074)
- Make the `is_sqlite3_present` check more robust (work with the system packaged sqlite library again too)

#### Operating System support
- ci: fix gcc-windows -std=c99 (#25534)
- os: add windows stdin_write() support (#25546)
- ci: use `macos-14` instead of `macos-13` (the older runner is being deprecated) (#25670)
- v.builder: fix json-errors with a windows path separator (#25680)
- ci: fix unsetting of VFLAGS in `v run ci/linux_ci.vsh v_self_compilation_usecache_clang`
- ci: stop unsetting VFLAGS completely in ci/linux_ci.vsh and ci/macos_ci.vsh
- builtin,os: fix windows execute ANSI encoding result, make msvc error messages readable in a Chinese locale (fix #25727) (#25736)
- db.sqlite: update windows version to https://sqlite.org/2025/sqlite-amalgamation-3510000.zip (#25766)
- os.notify: fix struct epoll_event alignment on ARM64/Linux (fix #25778) (#25779)
- fasthttp: Linux/epoll support
- math: reduce the nested level of expressions, to reduce the chances of stack overflows on windows
- net.http,ci,db.sqlite: rewrite .github/workflows/windows-install-sqlite.bat in .vsh, fix vschannel on windows downloading content > 32KB (#25792)
- v.builder: bump the default stack size for executables, when compiling with msvc on windows, to 32MB (#25824)
- ci: reduce the chances of false positives due to hangs of use_net_and_net_unix_together_test.v on windows
- doc: add subsections about using SQLite on windows and about installing the self contained `sqlite` module.
- v.builder: switch to using `-std=c99`, instead of `-std=gnu99` to avoid name colisions with C `linux` macros defined by gcc/clang (#25848)
- gg: set more sensible and user friendly defaults for the width, height and the title of new windows
- thirdparty: update thirdparty-openbsd-amd64_tcc.sh (#25945)
- ci: install plain gcc on the OpenBSD jobs
- ci: use `gcc` as the name of the compiler instead of `egcc` on OpenBSD
- ci: remove the gcc-openbsd job, until OpenBSD people fix their broken conventions on 7.8
- ci: run `v -W -silent test-self vlib` on linux, so deprecations/warnings introduced in PRs, can fail (and be fixed) earlier (#25955)
- ci: use VTEST_SHOW_LONGEST_BY_* vars on OpenBSD (#25958)
- ci: update to use FreeBSD version 15.0 (#25985)
- crypto.ecdsa: update to test and use OpenSSL 3.5 on OpenBSD (#25995)
- x.crypto.slhdsa: add support on OpenBSD using OpenSSL 3.5 (#25996)
- ci: reduce failure rate for the gcc-windows job, in test_if_v_test_system_works.v
- ci: skip use_net_and_net_unix_together_test.v on gcc-windows (many weird timeouts on unrelated PRs)
- db.sqlite: fix exec_param_many on linux for the case of a [][]string parameter
- v.util: add `-d max_suggestions_limit=140` for v itself, to improve handling of large .v files with many thousands of lines on windows
- v.util: bump max_suggestions_limit to 200, to account for windows
- ci: extract windows_ci_msvc.yml from windows_ci.yml to enable finer grained workflow/job control
- ci: extract and split windows_ci_tcc.yml and windows_ci_gcc.yml from windows_ci.yml for improved job control

#### Examples
- Handle closing of the window in the event manager in examples/viewer (#25522)
- ci: add a report-wrong-examples-in-doc-comments job, that runs `./v doc -check-examples -f none vlib/` (#25554)
- Make reproduction of failed examples easier (make sure that all the checked sources have an ending \n)
- Use math.vec in path_tracing.v and in vyper.v
- Support `v -d trace_execution run examples/brainvuck.v mandlebrot.bf`
- ci: do not use `-silent` for the `v build-examples` task on windows, to make it easier to diagnose recent gcc-windows timeouts
- doc: add an example for reading from a non empty buffered channel, after closing it
- Fix and improve vanilla_http_server (#25905)
- ci: remove `-silent` from the macos build_examples task too, to make remote diagnosing of CI timeouts easier
- Add optional `update_fn: fn (dt f32, ctx &gg.Context)` to gg.Context and gg.Config . Pass consistently the current GG context to *all* callback functions, instead of nil.
- Add expanding_rect.v (modeled after the example from https://love2d.org/wiki/love), add generic helpers gg.frgb/3 gg.frgba/4
- tools,examples,veb: fix `v -d trace_before_request run examples/veb/veb_example.v` after feedback from https://youtu.be/IuE6Bo1klK0?t=2100
- Move flag/ .v files 1 level up, to prevent module lookup confusion for unrelated examples
- Add a Lorem Ipsum Generator (#26036)
- examples,net.ftp,v.builder: remove remaining matches of `rg --multiline --multiline-dotall "continue\n\t+\}\n\t+\}\n\t+return" -B3 -A3 `
- Update lorem.v with a Markov algorithm for better text generation (#26085)
- fasthttp: fix the correctness of the minimal server example, when tested with curl (#26072)
- v.gen.native: fix `v -os macos -experimental -b native -o hw.macos examples/hello_world.v` on linux
- tutorials: remove newline in the example for c2v's cc compilation to `doomv` (#26200)
- Make all the labels fit in the default window size header in minesweeper.v


## V 0.4.12
*19 Sep 2025*

#### Improvements in the language
- json2: replace encoder with a new implementation. It's 70% faster than the old json2, and 110% faster than json that is based on cJSON (#25224)
- Virtual C consts with custom types (const C.MY_CONST u8)
- Support `-div-by-zero-is-zero`, which allows for `x / 0 == 0` and `x % 0 == x`, avoiding division by zero traps/panics (#24981)
- Limit -div-by-zero-is-zero influence to just the integer types (for f32 and f64, / produces a +inf or -inf value, and the program continues to run)
- VLS mode for the language server in pure V
- Add support for `@OS`, `@CCOMPILER` `@BACKEND` and `@PLATFORM` (#25174)

#### Breaking changes
- Deprecate `gx` and replace all occurences with `gg` (which now contains all the functionality of `gx`) (#24966)

#### Checker improvements/fixes
- Fix `sizeof(T)` usage in generic struct (fix #24806) (#24808)
- Add `$if sizeof(T) == int_literal {` support (#24831)
- Improve virtual C consts
- Markused,checker: fix hello world size after the introduction of `builtin.closure` in 2d87ac4 (#24989)
- Remove dump() dependency from ComptimeFor (#25000)
- Cleanup - remove unused c.using_new_err_struct (#25036)
- Cleanup `err` removal (#25043)
- Add comptime support for s390x, ppc64le and loongarch64 platforms (#25048)
- Allow for `v -is_o -o x mm.v`, where `mm.v` starts with `module abc` (i.e. not just `module main`)
- Fix calls with result propagation, using other consts, in const declaration expressions (fix #21609) (#25060)
- Fix array init with interface (fix #24255) (#25073)
- Fix missing map float key duplicated checking (fix #25098) (#25117)
- Fix missing check for struct generic init from call (fix #25084) (#25119)
- Fix missing check for empty array to generic param (fix #25056) (#25118)
- Rewrite comptime_if_cond() to support comptime if cond evaluate (fix #24938) (fix #25099) (#25122)
- Add error for struct not init (fix #24893) (#25134)
- Fix sql insert expr propagate result (fix #24833) (#25136)
- Fix checking return type call disregarding unwrapping (fix #25140) (#25143)
- Ensure the defer behavior matches that of cgen (fix #25148) (#25146)
- Nil check for c.table.cur_fn in gen_branch_context_string() (fix #25170) (#25171)
- Relax the "unreachable code after a @[noreturn] call" error to a warning to reduce prototyping friction (#25173)
- Fix multi return arg passing checking (fix #25167) (fix #25180) (#25177)
- Use keywords matcher trie for imported symbol presence checks, instead of `x in p.imported_symbol` (#25201)
- Fix iteration over mutable option (fix #24860) (#25199)
- Add `T.typ` and `T.unaliased_typ` checking to `$match` (fix #25200) (#25202)
- Add more checks for map.delete (fix #25204) (#25205)
- Fix static init var (fix #25203) (#25209)
- Add top level comptime support for `$match @OS {` too (#25222)
- Comptime match only eval true branch (fix #25223) (#25225)
- Fix multi return var passing to fn arg (potential fix for #24870) (#25250)
- Prevent usage of imported module name prefix as identifier names, to avoid cgen collisions (#25280)
- Disallow duplicate export names (fix #25301) (#25302)
- Reduce the verboseness of `unsupported size ... for global` messages, for `v -b native examples/hello_world.v`

#### Parser improvements
- Split parser methods to files based on topic (#24786)
- Fix arch loongarch64 comptime support (fix #24906) (#24907)
- Fix const error
- pref,parser: implement support for `-force-bounds-checking` to enable easier testing of functions tagged with `@[direct_array_access]` (essentially turning off that flag)
- Allow keyword as struct param key on fn call (fix #24957) (#24958)
- Fix syntax error for `for c in [othermod.Struct{field: 255}] {` (fix #24943) (#24978)
- Reduce calls to util.contains_capital
- Fix overriding of fn names in `-translated` mode (fix #25024) (#25061)
- Fix asm modifier parsing (allow for `=r, =&r, +r, +&r,=m,=rm,=@ccl, =*r`) (fix #25070) (#25072)
- Allow using aliased types in interface method implementations (provide backwards compatibility to `ui`, during the migration of code from `gx` to `gg`) (#25106)
- Fix interface method declaration with fixed array return type (fix #25137) (#25145)
- Prepare for eliminating a warning for `v -cross -o vc/v.c cmd/v` (part 1) (reduce CI annotation noise)
- Add duplicate import symbol detect (fix #25185) (#25187)
- vfmt,parser: move mark used from vfmt to parser (#25190)
- v.ast: add a `mod` field to ast.FnTypeDecl too

#### Compiler internals
- scanner: fix multi-level string interpolation in if/match branch (#24805)
- markused: fix mark for array init from sumtype (fix #24887) (#24889)
- markused: whitelist `_option_none` too (fix #24862) (#24885)
- markused: remove `@[markused]` from option and result fns (#24900)
- markused: skip unused symbols, dump fns and generic specialization (fix #24921) (fix #24927) (#24924)
- parser,markused: support `@[markused]` for interface declarations too (#24963)
- markused: fix interface fields and chan usage (fix #24961) (#24962)
- v.builder: add a clearer error message for `v -shared run empty.v` (issue found by Felipe Pena)
- markused: use eprintln for `PANIC DEPS` too (for consistency and easier redirection for the whole trace)
- v.util: add support for setting VUTIL_RETRY_MAX_COUNT=1 to ease the workflow for developing backends
- markused: improve the tracking of used closures (#25009)
- markused: improve array resources tracking + remove all_fns loop for orm (#25007)
- markused: fix generic map index (fix #25012) (#25022)
- markused: improve array tracking (range, gated) (#25023)
- markused: fix option tracking on sumtype (fix #25025) (#25028)
- markused: fix thread type mark by go/spawn expr (fix #25049) (#25054)
- scanner: refactor string interpolation (fix #24198) (#25053)
- markused: fix array append c code dependency (fix #25057) (#25058)
- markused: fix option array element (fix #23089) (#25179)
- markused: fix option map value (fix #25186) (#25188)
- parser,fmt,markused: add top level comptime `$if` support (enable `$if platform { import module struct Abc {} }`) (#25216)
- v.builder: add -DNO_DEBUGGING in addition to -DNDEBUG, when compiling with -prod
- v.builder: support `-d trace_type_symbols_after_checker`
- scanner: uncomment working rune test  (#25305)
- v.util: fix handling of "start \u005c${...} end" in cgen (fix #25304) (#25306)
- markused: fix marking of mutable generic method calls (fix #25312) (#25314)

#### Standard library
- x.crypto: initial addition of curve25519 module (#24748)
- thirdparty: add NDEBUG check before glGetErrorCode if-statement in sokol_gfx.h (#24754)
- math.big: remove unnecessary code from / and % (the same is done in div_mod, which they call) (#24766)
- builtin: add a rune iterator method to strings, allowing `for for i, r in s.runes_iterator() {` without first allocating an array for all the runes (#24769)
- builtin: support `-d builtin_free_nop` to help diagnose problems with too early manual free() calls
- builtin: use s.runes_iterator() in trim_runes/2 to avoid needless allocation
- builtin: add string.expand_tabs() (#24781)
- os: do not resolve symlinks in os.find_abs_path_of_executable/1 (fix #24759) (#24761)
- os: improve documentation (#24790)
- gg: allow for `-d gg_memory_trace_frame` to be used in combination with `-prealloc -d prealloc_dump`
- sync: add SpinLock (#24788)
- os: fix documentation for environ function (#24796)
- sync: fix documentation for new_spin_lock function (#24795)
- sync: add implementation for WaitGroup.go/1, add test (#24797)
- sync: improve documentation (#24799)
- sync: fix spin lock, add destroy() and try_lock(), add valgrind annotate support (#24798)
- os: add os.write_bytes/2 as a complement to os.read_bytes/1, add test
- sync: use SpinLock for channel (fix #24680) (#24802)
- crypto: fix ambiguous expressions in DES implementation (#24814)
- sync: use an atomic counter in test_waitgroup_go in waitgroup_test.v
- datatypes: add lockfree version of counter and ringbuffer (#24839)
- sync: add thread local storage (TLS) support (#24849)
- math.unsigned: fix rotate_left() for uint256, add test (#24872)
- math.unsigned: replace untested comments for uint256 public APIs (#24873)
- log: use `@[noinline]` for level_from_tag/1 and target_from_label/1 to avoid triggering panics for programs using `log`, compiled with -prod and -cc gcc>10 (fix #24874)
- math.big: fix toom-cook 3-way multiplication (#24888)
- runtime: add used_memory() (#24897)
- runtime: add note for the availability of the used_memory implementation (#24913)
- os: remove commented code in home_dir() function (#24929)
- math.big: fix the order of calculations in mod_pow() to improve performance (#24935)
- math.big: add shrink zeros to karatsuba and toom-cook (#24937)
- math.big: fix big_mod_pow() (#24939)
- os,runtime: move some C struct and fn def to `builtin` (#24942)
- math.big: fix validate_string and integer_from_regular_string (check for characters.len > 0, before accessing characters[0])
- builtin: prepare for adding a `-force-bounds-checking` option
- strconv: fix bounds check bug, discovered by the equivalent of `./v -g -force-bounds-checking test vlib/toml/` (thanks to tankf33der)
- builtin: fix OOB bugs in s.is_bin, s.is_oct, s.is_hex, discovered through `./v -force-bounds-checking test vlib/builtin/`
- regex: fix OOB bug discovered through `./v -g -force-bounds-checking vlib/regex/` (fix by @penguindark) (#24960)
- time: fix custom_format panic (fix #24977) (#24987)
- time: fix more panics in the supported specifiers in Time.custom_format/1 (#24988)
- vlib: add `archive.tar` module to enable reading of .tar ang .tar.gz files (#24995)
- builtin: fix warnings for `./v doc -m -f html vlib/builtin/`
- sokol.gfx: set the missed array_count field too in the `set_vert_uniform` and `set_frag_uniform` APIs (#25019)
- builtin: fix `assert "ä ö å æ ã ø ô é ë".title() == "Ä Ö Å Æ Ã Ø Ô É Ë"` (fix #25017) (#25026)
- Apply `@[markused]` to builtin_init, remove its heuristic from markused.v
- gg: improve drawing effect and logic of draw_rounded_rect_empty (#25062)
- math.bits: add asm implementations for some 64 bit ops (#25020)
- vls: autocomplete for module functions: e.g. `os. ...`
- math.big: move from u32 to u60 digits (#25018)
- os: simplify file.c.v using cross platform f.seek/2 calls, add EINTR handling to f.write_full_buffer/2 (fix #25107) (#25110)
- builtin: add arr.pop_left() func (#25133)
- math.big: refactor add_digit_array() (#25138)
- math.big: optimize add_digit_array() (#25139)
- math.big: optimize subtract_digit_array() (#25142)
- strconv: produce a maximum of 8 digits after the `.` for f32.str() (fix #25141) (#25144)
- math.big: restore and refactor str() and integer_from_string() (#25154)
- os: remove `unknown host OS` panic from os.get_host_os()
- flag: fix tail/single bool flag error condition logic in `flag_to.v` (fix #25166) (#25172)
- flag: improve the fix for #25166 tail/single bool flag error in `flag_to.v` (#25189)
- readline: fix wide char display width for Chinese characters (fix #25219) (#25220)
- repl: fix handling of lines with comments like `math.pi // comment` (fix #25229)
- time: always return utc() timezone for Time.unix/0 (fix #17784) (#25233)
- builtin: fix C prefix for proc_pidpath() (#25239)
- math.big: replace division with Knuth, improve performance (#25242)
- time: move the nanosecond comparison before the rest in the Time == Time implementation
- builtin: add a temporary ctovstring_impl/1 API to enable `ui` to compile cleanly for PR#25264, part 1
- json2: replace encoder with new implementation (#25224)
- json2: improve enum decoding; fix handling of required fields at the end of a json string (#25289)
- json2: improve checker with better EOF detection (#25075)
- json2: prepare for moving into json2 (#25039)
- json2: fix remaining json2 discrepancies (#25029)
- json2: support custom decoders (#25021)
- json2: fix number decoding and improve errors (#25015)
- json2: add support for decoding utf-16 surrogates, produced by some JSON encoder implementations (Python, Java, C#) (#25193)

- x.crypto: add a new `ascon` cryptographic module, based on https://doi.org/10.6028/NIST.SP.800-232 (Lightweight Cryptography Standards for Constrained Devices) (#25260)
- x.crypto.ascon: improve the core of Ascon permutation routine (#25278)
- x.crypto.ascon: improve single-shot functions of ascon hashing variant; add benchmark (#25282)
- x.crypto.chacha20: improves the internals of chacha20, add a bench (#25311)

### V interpreter
- Add comptime-if support (#24919)
- Reset return value after const eval and fix if-expr (#24955)
- Add more infix op support; fix early func return (#24965)
- Fix if-else; add infix op; fix func calls (#24972)

#### Web
- picoev: fix documentation (#24811)
- veb: fix `app.text()` -> `ctx.text()` in `README.md`
- net.http: fix panic in parse_multipart_form for invalid boundary (fix #24974) (#24976)
- net.http: remove debug println statement from post_multipart_form (#25030)
- net.http: reduce the false positives on the CI for server_test.v, let test_host_header_sent_to_server return early, when the server can not start
- net: improve tracing output for `-d trace_tcp`; move `error_code()` calls right after the corresponding C APIs (errno is a global that should be read immediately to be valid)
- veb: fix a spurious error with Chromium, for POST requests, split into 2 parts, 1st with only http headers, without body (fix #25191) (#25195)
- net.http: Use a full url when using a proxy, instead of only the path (#25228)
- net.http.file: allow for serving requests to static files with cache busting suffixes like `/dist/littlejs.js?1117`
- veb: fix generic field access from alias (fix #25215) (#25246)
- ci: change url to http://archive.ubuntu.com in .github/workflows/disable_azure_mirror.sh

#### ORM
- Support lowercase operators `like`, `in`, `not in` etc (fix #25032) (#25035)
- Fix sub_structs (fix #25104) (#25105)

#### Database drivers
- db: modify mysql/pg/sqlite interface for pool working (#24780)
- db.sqlite: fix get_text trimming data after (including) first 0 character (#25040)

#### Native backend
- Add comptime cpu archs support (#24956)
- Add support for (elf) globals  (#25016)
- Improve consts, support more assigns (#25277)
- Structs multi_assign and multi_return (#25281)
- Support more assign ops, reduce code duplication (#25283)
- Begin array support, `a := []Type{len: x, cap: y}` and `a[i]` read/write (#25299)

#### C backend
- Only run freestanding_module_import on amd64 (#24763)
- Fix sumtype option unwrapping (fix #24746) (#24770)
- Protect against unlimited recursion in type_default_impl, by converting to a verror/1 call instead
- Fix `static` and `volatile` var deref (fix #24778) (fix #24779) (#24807)
- Fix codegen for interface method closure get (fix #24810) (#24818)
- Fix codegen for multi return assignment with option type (fix #24812) (#24817)
- Fix if codegen when func parameter is option type (fix #24813) (#24816)
- Skip `struct none {` in cgen, if `none` is not used by V code reachable from `fn main() {` (#24824)
- Skip `struct map {` and related type declarations, when no V maps are used (#24826)
- Fix anon struct encode (fix #24836) (#24852)
- Fix json decode option alias (fix #24843) (#24853)
- Fix const indexexpr dep (fix #24850) (#24851)
- Fix codegen for generic interface with multi return generic type (fix #24838) (#24858)
- Fix anon struct init passing (fix #24879) (#24884)
- Allow alias to map `type Dict = map[string]string` (fix #24878) (#24883)
- Builtin,cgen,markused: add struct @[aligned] support for structs allocated on the heap too (#24886)
- Add a `__closure_init` call for sokol/gg programs on android as well (#24892)
- Allow alias types to be iterated if parent type has `next` method (fix #24890) (#24894)
- Use alias `next` method if defined in `for x in iterator {` (#24905)
- Fix const fixed array with type alias (fix #24936) (#24946)
- Fix callback codegen on generic struct resolution (fix #24947) (#24948)
- Move sort fn after interface definitions(fix #24465) (#24967)
- Fix struct field init within fn without result type (fix #24970) (#24973)
- Move closure C code to V code under vlib/builtin/closure/ (#24912)
- Parser,ast,checker,cgen: use enum comparisons instead of string ones on ast.ComptimeCall.method_name (#25003)
- Fix generic key's type with `in` operation (fix #24983) (#25011)
- Remove unused enum declarations too (#25033)
- Parser,checker,cgen: remove unused `err` declaration or `or { }` blocks (#25034)
- Add a test for builtin_init being present (part 2 of 4a6941a)
- Fix closures on s390x, ppc64le, loongarch64 platforms, add test to s390x CI (#25047)
- Fix anon fn checking adding unresolved generic type on codegen (fix #25050) (#25055)
- Fix building on Termux after fa904c4
- Use `#if defined __BIONIC_AVAILABILITY_GUARD && ...` to be compatible with more Termux versions
- Fix asm stmt separators (#25067)
- Fix translated file fixed-array assignment (#25080)
- Fix codegen for passing int from selector to voidptr expect arg (fix #25081) (#25083)
- Fix codegen for option void fn return block unwrap (fix #25074) (#25082)
- Fix alias to sumtype cast initialization (fix #25086) (#25091)
- Allow alias sumtype smartcasting (fix #25085) (#25096)
- Fix codegen for generic struct field array option (fix #25093) (#25097)
- Fix mutable sumtype (fix #25108) (#25111)
- Fix generic return assign to ComptimeSelector (fix #25125) (#25131)
- Fix address of call with `cast(&(arr.last() as Type))` (fix #23528) (#25132)
- Fix eq for anon C structs (#25152)
- Fix generated str method for enums that have C values (use ifs, instead of switch) (fix #25135) (#25157)
- Fix autofree with option array (fix #25124) (#25149)
- Fix assigning fn address (fix #24537) (#25158)
- Fix veb alias type identification and generic CastExpr (fix #24895) (#25155)
- Revert "checker,cgen: evaluate comptime `$if` results in checker *only* (fix #25123) (fix #25156) (#25150)"
- Evaluate comptime if results in checker only (with fixed -cross compilation) (#25162)
- Fix generic_fn_name generating incorrect names for C structs (#25164)
- Add comptime match support (#25165)
- Fix resolving generic interface field from generic struct (fix #23556) (#25182)
- Fix autofree used vars on return (fix #25196) (#25198)
- Fix hash stmt code generation (fix #25184) (#25207)
- Expose is_embed in FieldData (#25232)
- Fix alias enum used in comptime `$for` (fix #25211) (#25212)
- Ensure variable names do not conflict with builtin methods (fix #25063) (#25178)"
- Add `@[reused]` attribute to mark methods, reusing the receiver memory on return (needed for autofree) (fix #25221) (#25235)
- Fix gen_struct_equality_fn null pointer crash (fix #25237) (#25231)
- Allow generic alias enum comptime (fix #25249) (#25251)
- Fix big IntegerLiteral LL postfix (fix #25269) (#25275)
- Prefix `builtin` APIs with `builtin__` (#25264)
- Fix fixed-array const initializer (fix #25291) (#25293)
- Fix generic cast to sumtype of empty struct (fix #25263) (#25290)
- Fix option variadic arg passing (fix #25261) (#25273)
- Support for 64bit int 1 (#25236)
- Cgen,parser,markused: add export const support (fix #25300) (#25303)
- Fix i64 enum as a map key, when the enum values are too small (fix #25294) (#25310)

#### JavaScript backend
- Simplify comptime if; catch up with cgen (fix #25295) (#25313)

#### vfmt
- Fix `if x := g() { x } else { return }` adding newline after `return` (fix #24908) (#24945)
- Fix eating the attribute from `@[deprecated] pub type Alias = int` (fix #24968), workaround -usecache bug (#24969)
- Fix call expr with single line comment in or expr (fix #24659) (#25159)
- Fix comment line number in file with crlf line separator (fix #23524) (#25163)
- Add support for 64bit int with `-new_int` (part 2) (#25298)

#### Tools
- v.vmod,tools: support a repo_branch property in v.mod files, in addition to the existing repo_url property, to allow for backlinks to repos that use `main` instead of `master` as their core branch
- Make the output of `v should-compile-all` more immediately useful in CI jobs (turn off stdout buffering)
- Add support for `// vtest vflags: -w` in `_test.v` files, to allow `v -W test .` later, for files, that have known warnings
- ci: make sure the generator for vlang/docs can be compiled with latest V (prevent silent doc update stops, after breaking changes)
- Add cmd/tools/gg_split_memdump_to_frames.vsh to ease working with memdump.bin files generated by gg programs (split by frames)
- Add find_doc_comments_with_no_dots.v
- Improve summary output of find_doc_comments_with_no_dots.v
- Skip _test.v and _test.c.v files in find_doc_comments_with_no_dots.v
- ci: add report-missing-dots-in-doc-comments job
- ci: mark tcp_test.v and unix_socket_test.v as flaky (they still fail sporadically on the CI, although very rarely now)
- ci: add `-prealloc` self compilation checks on more platforms (#24891)
- docs,ci: check more vlib modules in the report-missing-dots-in-doc-comments job (#24928)
- ci: add a watchdog timer thread to ringbuffer_test.v, to make sure the program exits in a reasonable time (~10s). Let the test be retried 2 times in a row if it fails.
- ci: bump cross-platform-actions/action from 0.28.0 to 0.29.0 (#24952)
- ci: retry session_app_test.v 2 times, since it is network dependent, and sometimes (rarely) fails
- v.help: document the new `-force-bounds-checking` option
- Improve alignment for `v repeat "program" "program_that_is_over_10x_faster"`
- ci: add checks for compilation of vlang/gui to v_apps_and_modules_compile_ci.yml
- ci: retry 2 times vlib/net/http/server_test.v to avoid false positives for unrelated commits/PRs
- ci: force changes to vlib/x/json2 to trigger the full sanitized checks (the implementation there uses unsafe blocks and vmemcmp/3...)
- ci: workaround -usecache issue afte 2d87ac4
- ci: add a performance-compare-with-master job
- Fix `return""` in vdoc html output (fix #24979)
- ci,tools: implement support for VREPEAT_SILENT=1 and `v repeat -S`, to only show the summary of the runs, without the progress lines
- ci: fix the performance-compare-with-master job, when run on PRs (#25014)
- ci: trigger updates to the module docs, even if just only the static files for the doc generator are changed
- ci: make sure to always compare with the latest commit on the main V repo's master branch, when running .github/workflows/compare_pr_to_master.v
- ci: compare the sizes of small programs like hello_world.v, but generated with `-cc gcc` too
- ci: improve the alignment of the results of file size comparisons in compare_pr_to_master.v
- Improve the output of `./v doc -m -f html vlib/`
- Use `Copying` instead of `Generating` for the static resources in `./v doc -m -f html vlib/`
- ci: bump actions/download-artifact from 4 to 5 (#25051)
- v.help: document the `-is_o option` (in `v help build-c`) and add a test for it (#25052)
- ci: add experimental support for building V and testing on a Termux docker container (#25059)
- ci: use retry.sh for the `pkg install` in termux_ci.yml to reduce false positives.
- ci: update vlang/gui commit its latest e5cc33fe816fef33d718cb1b91f66d6bd38fb4a4
- ci: bump actions/checkout from 4 to 5 (#25095)
- ci: retry 3 times vdoc_file_test.v
- ci: add a build_on_ubuntu_25_ci.yml script, for testing bootstrapping with GCC 14.2.0 (#25109)
- ci: define TERMUX_VERSION in .github/workflows/termux_ci.yml instead of using `-os termux`, to make the emulation closer to a real Termux (#25128)
- ci: reduce timeout-minutes for CI jobs that are normally fast to help detect anomalies earlier (#25129)
- ci: add a disable_azure_mirror.sh script, and use it before `apt update` to reduce the recent timeouts during installing dependencies (#25147)
- ci: bump timeout-minutes to 15 in termux_ci.yml
- ci: bump actions/setup-java from 4 to 5 (#25153)
- ci: retry vlib/v/eval/interpret_test.v 2 times
- ci: bump retry time from 10 to 15 minutes (reduce false positives for slow dependency installations on the CI)
- ci: change the azure mirror URL in /etc/apt/sources.list too
- ci: use `awalsh128/cache-apt-pkgs-action@v1.5.3` instead of a manual `apt update/apt install` step, to leverage caching more (#25256)
- ci: check if `awalsh128/cache-apt-pkgs-action@v1.5.3` works on master (#25257)
- ci: extract .github/actions/cache-apt-packages-action/action.yml, use it in puzzle_vibes_ci.yml

#### Operating System support
- docs: add section in README for compilation on OpenBSD (#24775)
- crypto.ecdsa: add support for OpenSSL on OpenBSD (#24772)
- picoev: add implementation for OpenBSD using kqueue (#24801)
- log: fix `Unhandled Exception` on windows 7 (#24803)
- ci: migrate the remaining jobs from the deprecated windows-2019 image to windows-2022 (#24825)
- os: fix windows get_error_msg() leak (#24899)
- runtime: reduce allocations done in runtime.used_memory/0 on linux (#24901)
- ci: skip checking vlib/datatypes/lockfree/ringbuffer_test.v on the gcc-windows job for now
- runtime: add used_memory() implementation for FreeBSD (#24909)
- runtime: add used_memory implementation for OpenBSD (#24918)
- ci: skip ringbuffer_test.v in the tcc-windows and msvc-windows jobs too, to avoid flakyness for unrelated commits/PRs.
- ci: use FreeBSD version 14.3 after the bump of cross-platform-actions/action to 0.29.0 (#24953)
- time: fix timezone test on windows
- ci: add a release build for Linux on arm64 to release_ci.yml (#25064)
- thirdparty: add `thirdparty-linux-armv7_bdwgc.sh` for building `libgc.a` on ARMv7 CPUs (#25077)
- ci: bump retry count for server_test.v to 5 (reduce false positives on windows)
- ci: use `v build-tools` without flags for the tools-windows job
- os: eliminate warning for `v -cross -o vc/v.c cmd/v` on linux (part 2, see also 037a3b4)
- os,sync: enable running `v -cross -o x.c cmd/v` on windows too (part 1, fix V errors)
- ci: run .github/workflows/disable_azure_mirror.sh before all `apt update` commands, in ci/linux_ci.vsh, when run in a github CI runner
- ci: retry 3 times cmd/tools/vtimeout_test.v on windows, before failing
- os,ci: use a conditional include, instead of a platform file, to include libproc.h on macos only
- ci: run input_rune_iterator_test.v only on linux for now
- builtin: fix thread naming issue on Windows by ignoring RaiseException (0x406D1388) (#25270)

#### Examples
- Fix for `v build-tools` and `v build-examples` running on a i686 (the problem was discovered by @tankf33der)
- Add examples/sokol/sounds/simple_keyboard_synth.v
- builtin,markused: consider println of non string to use .str() method calls too, reduce generated C code for `v -cc gcc examples/hello_world.v` (#24996)
- Use a sieve of Eratosthenes in primes.v, to handle bigger inputs more efficiently
- vdoc: make -run-examples compatible with all output modes, not just the plaintext one
- vdoc: extract vdoc_run_examples_test.v from vdoc_file_test.v
- vdoc: implement -unsafe-run-examples and -check-examples support, add tests and document them
- builtin,vdoc: fix the examples for the builtin methods, so that `v doc -check-examples -time -f ansi vlib/builtin/` pass
- builtin,vdoc: make `v doc -unsafe-run-examples -time -f ansi vlib/builtin/` pass too
- vdoc: improve failed example report
- vdoc: support `v doc -check-examples -f none vlib/builtin`
- bitfield: fix `v doc -unsafe-run-examples -f none vlib/bitfield/` too
- arrays.parallel: fix `v doc -unsafe-run-examples -f none vlib/arrays/parallel/` too
- arrays: fix `v doc -unsafe-run-examples -f none vlib/arrays/` too
- compress.deflate,compress.gzip,compress.zlib,compress.zstd: fix `v doc -unsafe-run-examples -f none vlib/compress/` too
- sokol.audio: fix doc comment examples
- encoding.base64: fix doc comment examples
- math: fix doc comment examples
- readline: fix doc comment example by removing it
- semver: fix doc comment examples
- vdoc: enable example lines that have explicit imports too, fixup the remaining vlib examples, so `v doc -v -unsafe-run-examples -f none vlib/` could be added to the CI
- Add euler.v
- examples,gg: add examples/gg/grid_of_rectangles.v; add gg.Context.draw_rect_filled_no_context/5 and gg.Context.draw_rect_empty_no_context/5
- veb.auth: update the README.md example (#25245)
- builtin: fix `v -W -Wimpure-v examples/hello_world.v` (move ctovstring_impl to builtin.c.v)
- Fix rune casting from u32 in rune.v (#25307)




## V 0.4.11
*19 Jun 2025*

#### Improvements in the language
- Support a new CPU architecture s390x (#24107)
- Add initial support for ppc64le (#24287)
- Add initial support for loongarch64 (#24343)
- Support `js"string literal"` for JavaScript strings (#24653)
- VLS mode in the parser for the new language server in pure V

#### Breaking changes
- Remove deprecations made before 2024-11-06
- Add a deprecation note for `any` arg, prevent `any` from being used as map key,value or array type (#24277)

#### Checker improvements/fixes
- Fix chan element type validation with inexistent type (fix #23978) (#24008)
- Do not allow auto (de)reference in PrefixExpr *
- Fix check for pushing on an unwrapped option array (fix #24073) (#24093)
- Fix wrong type hint on predicate arg type mismatch (fix #24122) (#24123)
- Fix array generic return checking (fix #24104) (#24214)
- Fix stack var outside usage when var is a mutable param (#24249)
- Fix codegen for multi return with array fixed (fix #24280) (#24282)
- Check anon struct field valid case (partial fix of #24284) (#24286)
- Add check for recursive array init on struct (fix #21195) (#24278)
- Fix inherited var turning in auto heap (fix #24306) (#24312)
- Remove redundant callexpr `c.expr(mut node.left)` rechecks for `ast.CallExpr` (fix #24353) (#24380)
- Do not allow &u8(0), force nil like we do with &Type(0)
- Relax the new warning, allow for `pub const pname = &char(C.SDL_POINTER)` to fix the clean compilation of code using vlang/sdl3
- Fix for with mut generic value (fix #24360) (#24426)
- Add check for decomposing to interface (fix #24441) (#24453)
- Fix generic option array arg passing to `[]T` (fix #24423) (#24457)
- Fix resolver for returning struct generic (fix #24493) (#24506)
- Reallow passing closures as voidptr parameters with no warning, to enable convenient interfacing with C libs
- Disallow invalid expr for `filter`, `count`, `any`, `all` (fix #24508) (#24540)
- Replace warning by notice for UTF8 strings validation (fix #24538) (#24543)
- Revise logic for reporting import conflicts with module names (#24539)
- Fix struct update expr checking, when an alias is used (fix #24581) (#24582)
- Fix fn var resolver (fix #24525) (#24542)
- Fix checking for int to array of interface (fix #24624) (#24625)
- Cycle through all `ast.ParExpr` first in `prefix_expr` (fix #24584) (#24588)
- Move `arr <<` logic to `check_append()`
- Fix mutable const bug (fix #14916)
- Allow for calling main() inside _test.v files
- Fix missing type bounding to match expr on `or{}` expr (fix #24656) (#24658)
- Add error for `if mut x != none {`, when `x` is an immutable option (fix #24692) (#24694)
- Fix compound selector smartcasting/option unwrapping (fix #24662) (#24712)
- Fix mutable option (fix #18818) (fix #24622) (fix #24101) (#19100)

#### Parser improvements
- Fix parse_cflag() support other flags between allowed_flags (fix #24121) (#24146)
- Minimise allocations done for the common case in find_struct_field
- Fix orm generic struct table type parsing (fix #24049) (#24149)
- Fix mutiple imports at one line (#24241)
- Fix range expr precedence on compound logical and operator (fix #24252) (#24275)
- Fix invalid field name checking (fix #24279) (#24283)
- Fix wrong string parsing (fix #24297) (#24298)
- Fix panic for `struct Abc { pub mut: }` (fix #24404) (#24403)
- Allow `mut static counter := 0` inside `unsafe {}` blocks (prepare for removing a `-translated` mode quirk)
- Fix duplicate mod imports (fix #24552) (#24559)
- Reduce memory usage of ast.ScopeObject and ast.Ident instances (#24704)

#### Comptime
- comptime: fix comptime parameter resolve for `unsafe { nil }` to be `voidptr` (fix #25558) (#25570)
- comptime: fix codegen ptr field reading from comptimeselector (fix #25616) (#25620)
- comptime: dont emit empty blocks (#26171)
- comptime: support type interpolation in the msg argument of `$compile_warn(msg)` and `$compile_error(msg)` (#24992)
- comptime: fix $match with fn type (#25271)
- Support `$if T is $pointer {` and `$if T is $voidptr {`, to make it easier to implement a pure V dump(), without cgen specific code (#24628)
- i32 is now `$int` too (fix #24346) (#24378)
- Fix `$dbg` with `@[heap]` structs (fix #23979) (#23989)
- Check invalid comptime field name assignment (fix #24415) (#24421)
- Enable s390x + docs (#24114)

#### Compiler internals
- Remove closure usage from the compiler frontend (simplify bootstrapping/porting on more exotic platforms)
- markused: support orm or expr (fix #24040) (#24059)
- markused: fix for gated index range on string (fix #24187) (#24200)
- v.util.version: fix output for V full version when VCURRENTHASH not defined (#24264)
- markused: fix generic method call mark (fix #24395) (#24399)
- v.pref: add get_build_facts_and_defines/0 and set_build_flags_and_defines/2
- v.util.version: fix output for V full version (followup on issue #24263 and PR #24264) (#24478)
- v.util: use internal diff (#24495)
- v.pref: prevent overriding backend (fix #21758) (#24526)
- markused: fix for generic ptr receiver on method call (fix #24555) (#24558)
- markused: fix `x := t.wait()`, when `t := go fn () string {` (fix #24577) (#24580)
- markused: fix printing smartcasted interface values (fix #24579) (#24583)
- pref: avoid changing the backend with `.js.v` when `-backend` has already been used (fix #7840) (#24654)
- Remove dump() calls inside the compiler itself (make bootstrapping of dump() implemented before cgen easier)

#### Standard library
- builtin: string.index_after() ?int
- cli: account for initial indent on subcommands (#23985)
- Remove `strings.Builder.clear()`, fix `array.clear()` not working in the JS backend (#23992)
- gg: make draw_rect_empty/5 draw more exact borders, independent of the device, and fitting the draw_rect_filled/5 shapes (#24024)
- sync: fix a helgrind false positive, for a data race, on PoolProcessor (#24023)
- sync.pool: restore the parallel operation (surrounding the cb call in process_in_thread in a lock in 1b52538, effectively disabled parallelism)
- x.crypto.chacha20: change internal cipher to support a 64 bit counter (related to #23904) (#24039)
- os: fix swap_bytes_u64 (#24033)
- x.crypto.chacha20: fix `xor_key_stream` failing after a while (fix #24043) (#24046)
- crypto.sha3: be big-endian friendly (#24045)
- x.crypto.chacha20: makes the underlying cipher routine aware of the 64-bit counter (#24050)
- x.crypto.chacha20: enable support for 64-bit counter (fix #23904) (#24053)
- x.crypto.slhdsa: add a SLH-DSA implementation, a stateless hash-based DSA, a post quantum cryptographic module (#24086)
- encoding.binary: add encode_binary()/decode_binary() generic functions (#24106)
- crypto.rc4: change the return type of `new_cipher` to be `!&Cipher` (#24113)
- crypto: add a `crypto.ripemd160` module (#24119)
- encoding.iconv: fix iconv on termux (fix #23597) (#24147)
- sync: remove the call to C.pthread_rwlockattr_setpshared (not needed, since it is the default on POSIX) (#24166)
- pkgconfig, termios: Support NetBSD (#24176)
- encoding.binary: fix serialize map struct (fix #24190) (#24192)
- builtin,v.gen.wasm: support `-b wasm -d no_imports` (#24188)
- datatypes: add a Set.array/0 method to help get all the elements from a set as an array (#24206)
- json: fix option time (fix #24242) (fix #24175) (#24243)
- log: add local time / utc time selection support (#24268)
- json: link with libm (fix #24272) (#24273)
- rand: add uuid_v7(), session function, simplify uuid_v4() (#24313)
- toml: fix handling of multiline string with CRLF (fix #24321) (#24322)
- toml: fix crlf escape check (fix #24328) (#24329)
- x.json2: add u16(),u32() (fix #24337) (#24342)
- rand: fix uuid_v7 seperator (#24348)
- rand: check the separators for the generated UUIDs in random_identifiers_test.v
- builtin: add string.is_identifier() (#24350)
- x.crypto.chacha20: add a check counter overflow to set_counter for standard mode (#24365)
- comptime: fix `$if var.return_type == 1 {` (fix #24391) (#24393)
- comptime: enable ppc64le, add docs (#24433)
- toml: add compile error when passing `encode/1` types of T != struct (fix #24435) (#24443)
- sync.stdatomic: workaround for libatomic.a indirect symbols tcc bug (fix #23924) (#24472)
- math.big: fix the + operator for big.Integer for negative numbers, add test (#24487)
- math.big: respect the sign of the dividend in % operator, add test (#24489)
- os: add note for the availability of the debugger_present implementation (#24492)
- term: add writeln_color() (#24463)
- math.big: add missing assert for test_multiply_karatsuba_02 (#24534)
- builtin: fix mix prod and debug ucrt lib (#24498)
- math.big: fix Karatsuba's add_in_place() function, add carry handler on exit (#24541)
- math: add `exp_decay` to `interpolation.v` (#24545)
- math.big: optimize divide_array_by_digit() (#24566)
- sync.stdatomic: add atomic types (#24561)
- sync.stdatomic: turn panic() in new_atomic[T]() into a $compile_error() (#24573)
- sync: add condition support (#24574)
- builtin: flush stdout on panic (#24606)
- Document the behaviour of % for negative numbers; in V: -10 % 7 == -3 (#24604)
- math.big: remove unnecessary casting from Integer.is_power_of_2/0 (#24614)
- math.big: make is_power_of_2() be false for negatives (it now matches Julia's ispow2/1) (#24619)
- vlib: vanilla_http_server (#24202)
- os: support `dotfiles := os.walk_ext('.', '', hidden: true)` (#24617)
- builtin: remove playground related code (the current playground uses a container/sandbox) (#24632)
- comptime: fix `T.indirections` comparison (fix #24630) (#24636)
- math.big: add test for radix_str() and integer_from_radix() (#24644)
- runtime: make free_memory() and total_memory() return Result types to allow for reporting errors (#24651)
- math.big: improve the performance of radix_str() ~9 times (#24666)
- math.big: speed up ~10x integer_from_radix() (#24674)
- sync.stdatomic: fix bug with add() and sub() returning the new values, add voidptr support, add swap() and compare_and_swap() (#24685)
- sync.stdatomic: add atomic_thread_fence(), cpu_relax() (#24690)
- v: support `@DIR` (as a comptime equivalent to `os.dir(@FILE))` at runtime) (#24742)
- thirdparty: print the glGetError() code on failure too in sokol_gfx.h, to make diagnostic easier
- builtin: make array.ensure_cap/1 public
- os.font: fixes for `-os android`
- vlib: add a pool module (#24661)
- zstd: make the api more V like
- szip: fix panic on empty files (#24335)

#### Web
- net: add `read_ptr/2` (from `read/1`) to `UdpConn` for consistency with `TcpConn` (#24000)
- net: make `close/0`, `select/2` and `remote/0` methods of `UdpSocket` `pub` (#24004)
- Fix $dbg on function that uses veb comptimecall (fix #23999) (#24088)
- veb: allow route methods, that are tagged with `@[unsafe]`
- veb: support `-d veb_max_read_bytes=16384`, `-d veb_max_write_bytes=16384`, `-d veb_default_port=1234`, `-d veb_max_http_post_size_bytes=8388608`
- net.http: support `v -http -d http_folder=vlib/_docs` (allow customizing the folder, port, and index file through CLI arguments to v -http)
- thirdparty: upgrade to mbedtls v3.6.3.1, add a .patch file with the local changes (#24602)
- veb: fix handling of default CorsOptions.allowed_headers (#24703)

#### ORM
- orm: fix default value quote (fix #24052) (#24057)
- orm: fix type alias not supported in table columns (fix #15478) (#24062)
- orm: fix gen sql complex where (fix #24136) (#24138)
- orm: skip orm_complex_where_test.v for `sanitize-memory-clang` too
- orm: add function call based builder API for dynamic queries (fix #24178) (#24196)
- orm: set default value for require field if database value is null (fix #24221) (#24222)
- orm: fix option field with default null value (fix #24222) (#24228)
- orm: add or_where() method to the builder (fix #24244) (#24250)
- orm: add IN and NOT IN (#24634)
- orm: add `in` and `not in` to orm_func (fix #24639) (#24642)
- breaking,orm: add table attrs; add table/field comment support for mysql and pg (#24744)

#### Database drivers
- db.mysql: use mysql datatype for alloc string_binds_map, not orm's (#24126)
- db.mysql: fix handling of nullable timestamp (fix #24120) (#24125)
- db.mysql: add null result support (fix #24130) (#24131)
- db.mysql: use hardcoded const declare (fix #22086) (#24162)
- db: connection pool (#24161)
- db: mysql,pg,sqlite add transaction support (fix #24290) (#24352)
- db.pg: fix incompatible fn signature (#24549)
- db: add redis (#24730)

#### Native backend
- native: use builtin exit function (#24578)
- native: improve string support (#24600)
- native: implement `for in string` for amd64 (#24613)
- native: support nested structs, improve support for right expr of IndexExpr (#24627)
- native: leave only the unique paths in g.linker_include_paths, before doing lookups
- native: support C constants (#24660)
- native: add a temporary special case for `C.EOF` (#24724)

#### C backend
- Fix parallel cached_type_to_str access (fix #23980) (#23998)
- Fix codegen to make mutable sumtype working (fix #23982, part 1, needed for bootstrapping) (#23988)
- Fix arm64 asm operand position; fix arm64 asm imm; support arm64 dot instruction (#24017)
- Fix mutable ptr sumtype  (#24021)
- Fix asm comments of arm32 (#24025)
- Allow asserts inside fns, called in const/global initialization, in test files (fix #24029) (#24031)
- Fix codegen for option return unwrapping on last statement (fix #24026) (#24030)
- Fix match option with case non option (fix #24047) (fix #24048) (#24051)
- Support measuring programs, that use multiple threads in the new profiler column (turn `prof_measured_time` into a thread local, for the supported C compilers) (#24061)
- Fix `@[keep_args_alive]` with ptr (fix #23973) (#24058)
- Remove unused macro V64_PRINTFORMAT
- Fix option array push on unwrapped array (fix #24073) (#24079)
- Fix nested array support for the orm (fix #19327) (#24080)
- Fix `x in [...]!` operator with fixed arrays (fix #24082) (#24083)
- Fix codegen for comptime multiline attr (fix #23964) (#24087)
- Fix codegen for selector with embed field option (fix #24084) (#24085)
- Fix generic result return (fix #24097) (#24100)
- Fix showing the expression, as literal value, in case of `assert s[x..y] == "literal"` (fix #24103) (#24105)
- Fix codegen for option unwrapped var passed to generic option type (fix #23972) (#24096)
- Fix selector option unwrapping on infix (fix #24108) (#24115)
- Sort the paths, used in coutput_test.v
- Skip emitting mman.h and pthreads related code, for freestanding builds (#24118)
- Add s390x assembly support + test (#24129)
- Parser,checker,cgen: fix wrong auto heap deref of auto `index` loop var (fix #24117) (#24124)
- Fix non-voidptr to voidptr on `-cstrict` + notice about such usage (fix #24139) (#24143)
- Fix multi return with option type (#24144)
- Remove obfuscation (`strip` should be used instead); temporary fix for usecache + toml
- Fix zero left padding (fix #24199) (#24201)
- Fix variadic sumtype args passing (fix #24150) (#24207)
- Fix codegen for const to c string (fix #24235) (#24248)
- Fix codegen for fixed array init with init using structinit (#24269)
- Fix missing braces for const init with castexpr from option unwrapping expr (#24276)
- Fix codegen for index expr on for loop with branchstmt (fix #22760) (#24289)
- Fix codegen for assigning fixed array on defer var (fix #24300) (#24305)
- Fix codegen for multi return with aliased fixed array (fix #24280) (#24295)
- Fix codegen for nested selector unwrapping on lhs (fix #24292) (#24293)
- Add ppc64le assembly support + test (#24299)
- Fix s390x closure thunk (use floating point register) (#24258)
- Fix riscv64 closure thunk (use floating point register) (#24315)
- Fix codegen for writing on unwrapped selector (fix #24316) (#24323)
- Fix codegen for thread.call() on var auto heap (fix #24326) (#24327)
- Fix codegen for handling multiple return result type on call (fix #24341) (#24344)
- Fix codegen for nested selector option ptr (fix #24339) (#24345)
- Fix arm64 closure + remove stub in test (#24332)
- Workaround tcc aarch64 bug (fix #24331) (#24354)
- Fix riscv32 closure (#24355)
- Fix codegen for anon option fn struct field init (fix #24392) (#24400)
- Fix `if mut var != none {` for optional interface values (fix #24351) (#24410)
- Fix interface `unsafe {nil}` comparison and initialization (fix #24374) (#24411)
- Ast,cgen,parser,pref: support loongarch64 inline assembly, add test (#24440)
- Fix array init with interface element type (fix #24442) (#24454)
- Fix const declaration dependant mapping when using update_expr (fix #24437) (#24455)
- Fix comptimecall with map receiver (fix #24448) (#24449)
- Fix assign from `for mut var in arr {` to pointer (fix #24432) (#24456)
- Workaround tcc aarch64 fn call bug (fix #24473) (#24477)
- Workaround tcc aarch64 spawn call bug (fix #24482) (#24483)
- Fix map of fixed array value in if guard (fix #24488) (#24496)
- Fix codegen for assigning `nil` or `0` to option ptr field (fix #24447) (fix #24500) (#24502)
- Fix codegen for array of option element auto eq `a == [?int(none)]` (#24504)
- Fix codegen inconsistency handling `nil` param to arg expecting ptr (fix #24491) (#24503)
- Fix pattern generated by `const_init_or_block.vv` in `vlib/v/gen/c/coutput_test.v`, when VFLAGS=-no-parallel is used
- Fix tmp var redeclaration on const inited later (fix #24521) (fix #24517) (#24524)
- Fix generic name handling for struct generic (fix #24530) (#24565)
- Fix initialize error object in or_block (fix #24529) (#24576)
- Improve the readability of `switch() {` statements, generated by `match() {` ones (#24618)
- Reduce v.c size by ~4% by removing comments and using shorter literals
- Fix enumval str() call on stringinterliteral (fix #24702) (#24705)

#### JavaScript backend
- Fix array type checking in sum type match expressions (fix #24237 ) (#24259)
- js: fix callbacks in structure parameters (fix #24260) (#24324)
- Fix array initialization with "index" and "it" (fix #24397) (#24429)
- Cannot assign unsafe nil values (fix #24407, #24436) (#24458)
- Fix alias type initalization (fix #24475) (#24480)
- Fix casting (fix #24512) (#24519)
- Alias types are not properly resolved (fix #24486) (fix #24507) (#24514)
- Implement Map.keys() and Map.values() methods (fix #24209) (#24608)
- Fix string.runes method (fix #20500) (#24609)
- Fix direct map key access and map.len (fix #24616, fix #24605) (#24620)
- Fix map to string fails on rune keys (fix #24637) (#24638)
- Fix maps being always constructed using string keys (fix #24607) (fix #24671) (#24673)
- Fix slightly incorrect JS (esbuild was broken on master) (fix #23711) (#24676)

#### vfmt
- Convert `"hello".str` => `c"hello"` (fix #24635) (#24652)

#### Tools
- Let test_os_process.v use `unbuffer_stdout()` to make the output more reliable
- os,tools: make easier analyzing process_test.v failures on the CI
- ci: fix build conditions that had `sanitize-memory-clang?` instead of `sanitize-memory-clang`
- ci: skip running the `s390 CI` job for simple doc/yml changes (#24160)
- ci: fix shell script issues reported by actionlint (#24168)
- Remove the `src` subdir from projects, created by `v new` (#24236)
- Add support for `// vtest build: !os_id_ubuntu?` tags in the _test.v files, detected by `v test`
- ci: fix `v -o v2 -usecache cmd/v` after ad5b829
- Fix vrepl for `import mod { f }` (#24340)
- ci: debug hub_docker_ci.yml issue (try 1, disable cache, run linters)
- ci: debug hub_docker_ci.yml issue (try 2, add concurrency group, add a persistent single builder `gh-builder`)
- ci: debug hub_docker_ci.yml issue (try 3, restore the cache-from:/cache-to: lines)
- ci: fix hub_docker_ci.yml issue - comment out the cache-from:/cache-to: lines again
- Support vreduce timeout, vreduce custom run command (#24359)
- Rewrite `v timeout`, support killing the child process on timeout by default (#24367)
- Use breadth first search in vreduce (#24369)
- Vreduce fix var names (#24373)
- Fix `v timeout 2 sleep 5`
- Fix `./v -d network test cmd/tools/vpm`
- ci: reduce false positives for cover_test.v and vdoc_test.v
- Save the modified content more frequently in `v reduce`, fix timeout leaks (#24405)
- Reduce padding for `v doc` produced html nodes too
- ci: reduce the noise in check annotations for github PR reviews, due to the new warning in option_test.c.v
- Improve show_ancient_deprecations.v, by ignoring false positives for deprecation tags in // comments
- Check for Git repository in `v doctor` (packaged V versions often lack a .git/ folder) (fix #24419) (#24420)
- vlib,tools: add an `arrays.diff` module, implement a simple platform independent tool `v diff file1.txt file2.txt` using it (#24428)
- ci: bump creyD/prettier_action from 4.3 to 4.5 (#24439)
- ci: use `v retry` to reduce the false positives for retrieving the dependencies for vinix too
- ci: show `hg version` too, to ease the diagnosing of install_version_test.v failures
- Let cmd/tools/vpm/install_test.v use a .hg/hgrc file too
- repl: fix typeof(a) with warning (fix #24499) (#24515)
- Make `v doctor` show CFLAGS and LDFLAGS too (if set)
- Make `v search ui` work again through the vpm site (fix #23966) (#24535)
- ci: fix unused var warning in cmd/tools/vpm/common.v
- ci: prevent future changes to cmd/tools/vpm/common.v, that introduce warnings/notices to pass in PRs
- x.benchmark: align the output of BenchmarkResult.print/0
- Ease diagnosing CI failures of vtimeout_test.v
- ci: make sure that only one copy of native_test.v is executed at once, when run through `v test vlib` (fix #24505)
- Ignore .db and .sqlite files by default in `v watch` (such DB files are very likely to change during prototyping)
- .gitignore: ignore .db and .sesskey files as well
- ci: bump creyD/prettier_action from 4.5 to 4.6 (#24687)
- Make  `v doc -f md module` output useful by default (#24737)
- ci: fix native_backend_ci.yml concurrency group setting (prevent jobs for different commits on master to cancel each other)
- Fix overflow detected in the sanitized runs on the CI (#24064)
- ci: reduce code duplication in linux_ci.vsh

#### Operating System support
- os: implement Process.is_pending() on windows (fix #23990) (#23993)
- os: support .set_environment() on windows too (fix #10628) (#23996)
- thirdparty: update thirdparty-linux-amd64_tcc.sh, to also record its own full invocation command, and commit the changes automatically
- thirdparty: add thirdparty/build_scripts/thirdparty-freebsd-amd64_tcc.sh
- ci: reduce false positives for slow runs of the gcc-windows job
- gg: fix screen_size() on macos with multiple displays
- ci: add riscv64_linux_ci.yml (based on QEMU) as well (#24181)
- ci: use `apt update` before `apt install` in cross_ci.yml, to make the linux job more robust
- thirdparty: add thirdparty/build_scripts/thirdparty-macos-arm64_tcc.sh for compiling tcc on macos (first draft)
- Simplify the implementation of get_linux_os_name in `v doctor`
- os.filelock: compile without warnings with gcc on windows
- ci: use windows-2025 for the gcc-windows job (since it has gcc 14.2.0) (#24304)
- ci: skip option_ptr_unwrap_test.v on windows with msvc (#24320)
- os: fix windows rmdir GetLastError() (fix #24356) (#24357)
- Enable windows tcc_backtrace() support (#24377)
- ci: reduce false positives for init_global_test.v on windows (retry it 2 times)
- ci: reduce false positives for orm_func_test.v on windows (retry it 2 times)
- os: force using `C.CREATE_NO_WINDOW` on windows in os.raw_execute/1 (fix #24390) (#24418)
- Fix v doctor output on FreeBSD ; do not run ldd to get the glibc version (#24427)
- runtime: improve free_memory implementation for OpenBSD, by getting the stats from its UVM system (#24431)
- runtime: fix cast error in free_memory implementation for OpenBSD (#24445)
- Use a `.hg/hgrc` file for install_version_test.v (workaround windows failure)
- os: add debugger_present implementation for OpenBSD (fix #23603) (#24490)
- veb: reduce veb_max_write_bytes from 16KB to 2KB (fix sending large dynamic responses from veb on macos/freebsd) (fix #24523) (#24522)
- os: fix os.File's tell/0 method for windows (fix #24217) (#24218)
- net.openssl: replace SSL_get1_peer_certificate by SSL_get_peer_certificate for OpenBSD (#24556)
- net.mbedtls: disable AES-NI on OpenBSD with tcc (fix #22239) (#24560)
- net.mbedtls: enable MBEDTLS_THREADING_C and MBEDTLS_THREADING_PTHREAD on OpenBSD (#24572)
- thirdparty: add thirdparty/build_scripts/thirdparty-openbsd-amd64_tcc.sh for compiling tcc on OpenBSD (#24592)
- v.builder: enable -fwrap for C compilation on OpenBSD too (#24585)
- v.pkgconfig: add the default `/opt/local/lib/pkgconfig` for MacPorts on macos (#24626)
- sync: increase retries for vlib/sync/select_close_test.v to 3, to reduce CI false positives in the gcc-windows job
- ci: remove script to build tcc on FreeBSD (obsoleted by thirdparty/build_scripts/thirdparty-freebsd-amd64_tcc.sh) (#24681)
- encoding.iconv: add path for iconv library on FreeBSD (#24682)
- native: skip linux.vv too, for the sanitized jobs (similar to libc.vv)
- ci: migrate from windows-2019 runner to windows-2025 runner in most jobs (github deprecated the 2019 runner) (#24672)
- runtime: fix -cstrict compilation (use usize() cast in free_memory) on OpenBSD (#24696)
- Remove specific case for FreeBSD in `cmd/tools/vtest_test.v` (#24707)
- docs: add section in README for compilation on FreeBSD (#24706)
- thirdparty: add script to build libgc on FreeBSD/amd64 (#24717)
- builtin: use local static libgc for FreeBSD with tcc (fix #24710) (fix #24683) (#24720)
- ci: update and improve FreeBSD CI (#24726)
- ci: add CI for OpenBSD (#24732)
- gg: fix .char event handling for backspace, delete, tab and enter for linux/x11 (send appropriate .char codes to the apps, similar to macos)
- Add aarch64 atomics support in thirdparty/stdatomic/nix/atomic.h (fix #24294) (#24296)
- v.trace_calls: now musl has gettid(), there is no need for the shim on newer Alpine etc (#24245)

#### Examples
- Fix `v -os wasm32_emscripten -o ms.html examples/gg/minesweeper.v` (use os.asset to load the font, avoid the implicit closures for the frame/event callbacks)'
- Update rotating_textured_quad.v with instructions on how to compile/run it with emscripten and a browser
- Add a small examples/gg/bouncing_balls.v simulation of falling balls
- Fetch 30 stories instead of 10 in examples/news_fetcher.v
- Add sync_pool.v for easier testing/diagnosing issues with the `sync.pool` implementation on different platforms
- Add a `-profile` report column, to show only the func time, *excluding* the accumulated children calls time (usable through `./v -profile - run a.v |sort -nk3` for example) (#24056)
- doc: improve Shared and Channels's topics, add more examples (#24155)
- orm: fix option type, convert from int to i8, add examples, etc (fix #24211) (#24213)
- Fix optional callback parameter and improve examples (fix #24325) (#24336)
- Reduce padding for code examples, to fit more examples on the same screen without scrolling
- Cleanup unsafe{} blocks that are not needed anymore in examples/sokol/08_sdf/sdf.v
- Show the number of pushes in sokoban too
- os.asset: add read_text/2 too, use it to simplify the sokoban example
- Support directly loading sokoban level files by path
- Add more Sokoban levels
- Support boxoban style collections of levels files (from https://github.com/google-deepmind/boxoban-levels/)
- Add a simple sudoku solver
- Add primes.v, that shows how to get command line arguments, and use loops and functions
- Add a small memory game (#24643)
- Cleanup memory.v (reduce it to 135 lines)
- builtin,os: enable no warnings for gg programs like `v -gc boehm_leak -cg -keepc run examples/gg/minimal.v` (part 1 - before the `gg` loop) (#24749)


## V 0.4.10
*20 Mar 2025*

#### Improvements in the language
- Implement assignable anonymous struct (fix #23855) (#23857)
- Remove ancient deprecations (#23479)

#### Breaking changes
- Make old `[attr]` syntax an error (`@[attr]` has to be used instead)
- builtin: `string.index_after()` now returns an Option (like `string.index()`), use `string.index_after_()` for the old behavior
- Vweb is now deprecated in favor of faster and more stable and easy to use veb

#### Checker improvements/fixes
- Allow `none` to be passed to `?T` param (fix #23381) (#23385)
- Fix `for` iterator method `.next()`, not marked as used (fix #23312) (#23321)
- Fix generic var inferring to be passed to `[]T` (fix #23315) (#23322)
- Clean up and optimise infix - reduce `as` casting (#23327)
- Fix structinit validation on nested generic Map[K]V (fix #23329) (#23332)
- Fix comptime indexexpr resolving (#23333)
- Fix comptime evaluation on infix expr (fix #23341) (#23344)
- Fix alias to fixed array w/ size defined by constant (fix #23356) (#23357)
- Fix missing option variable checking when casting using `as` operator (fix #23349) (#23358)
- Fix assign expected type on rechecking enum assigns (fix #23366) (#23367)
- Allow calling `foo(?i64(123))` for `fn foo(x ?I64) {` and `type I64 = i64` (#23373)
- Cache `node.args[0]` on `fixed_array_builtin_method_call` and `array_builtin_method_call` (#23411)
- Fix missing check for invalid prefixexpr expression `&(&var)` (fix #23365) (#23418)
- Disallow `&((&a))` and similar expressions, with innermost `ast.PrefixExpr` (enhance #23418) (#23419)
- Fix call with mut arg with different pointer levels (fix #23157) (#23428)
- Fix missing detection for `return` in lockexpr stmts (fix #23434) (#23435)
- Do not allow auto reference of voidptr params
- Check if unwrapped `m[key]` if m is `Option` (fix #23446) (#23459)
- Builtin,checker: remove `@[markused]` from `fn isnil()`, set `c.table.used_features.auto_str_ptr = true` instead (#23464)
- Fix checker generic alias type (fix #23474) (#23475)
- Fix missing check for `a := [none]` (fix #23457) (#23504)
- Fix missing check for concrete type on match branch expr (fix #23506) (#23508)
- Fix missing check for invalid argument for builtin (fix #23511) (#23515)
- Fix selector nested unwrapping (fix #23519) (#23521)
- Fix message with old attr syntax (#23529)
- Cache repeated `node.args.len`, `method.generic_names.len`, `node.concrete_types.len` and `node.op.str()` (#23536)
- Disallow `expr is Type` if expr is Optional (fix #23486) (#23510)
- Make `option_var.str()` an error, when done without unwrapping it first (fix #23557, fix #23558) (#23563)
- Fix private symbol visibility checking (fix #23518) (#23543)
- Disallow constant modification on unsafe {} (#23588)
- Fix sumtype variant option type mismatch (#23659)
- Disallow `arr = voidptr(0)` (fix #23675) (#23687)
- Allow for `module no_main` programs, that can redefine their own main function, or not define any of their own as well
- Fix match branch checking of nonreturn call on last expr (fix #23698) (#23699)
- Check and error for invalid utf8 string literals (#23721)
- Fix call from unknown enum (fix #23728) (#23730)
- Add checker for passing multi return as arg to func that expects less param (fix #23735) (#23744)
- Fix spreed operator ref field validation (fix #23759) (#23760)
- Fix missing check for method that returns veb.Result (fix #23647) (#23762)
- Allow generic operators to be called in fn (fix #23773) (#23774)
- Fix missing struct cast validation (fix #23748) (#23788)
- Fix map when casting to interface (fix #23790) (#23799)
- Allow for `pub type C.HINSTANCE = voidptr`, being used in `@[export: "wWinMain"] fn mymain(x C.HINSTANCE, xprev C.HINSTANCE, lpcmdline &C.WCHAR, cmdshow int) int {` in `module no_main` programs (#23812)
- Add option type inference on if expr (implement most of #23827, except the error for `v := if c { none } else { none }`) (#23829)
- Add missing check for IfExpr and MatchExpr with no valid type (#23832)
- Fix MatchExpr type inferring, when `none` is used (fix #23831) (#23833)
- Add missing check for generic fntype type names (fix #23453) (#23850)
- Add checking for comptime assign without comptime if checking (fix #23796) (#23848)
- Fix option ptr field assign checking (fix #23879) (#23880)
- Add missing `any` type validation on assignment (fix #23905) (#23906)
- Add fntype casting validations (#23872)
- Fix signed integer literal overflow error, when most significant bit occupies signed bit (fix #23782) (#23919)
- Add missing check for casting generic type to literal values (#23915)
- Check if next() method infers generic type correctly (fix #23927) (#23932)
- Disallow references to constants (fix #23935) (#23942)
- Fix typeof evaluation for generic reference (fix #23951) (fix #23952) (#23958)

#### Parser improvements
- Reduce allocations in empty_comptime_const_expr (#23324)
- Add error for array init of Results `[]!type{}` (fix #23360) (#23375)
- Allow map cast syntax `map[k]v(expr)` (#23401)
- Inline some commonly used fns (#23535)
- Fix anon fn return type option/result followed by comment parsing in vfmt mode (fix #23607) (#23608)
- Keep track of the number of all scanned tokens too, and show it with `-stats`
- Fix the error message position, for a `struct Abc`, that lacks a body (#23627)
- Prevent unused warning on `import mod { Sym }`, when `Sym` is later used, for more cases (fix #23412) (#23626)
- Add support for `-d trace_parse_file_path_and_mod`, to help diagnosing module lookup problems
- Allow for `@[has_globals]` to be used for all V programs, turn the `@[wasm_import_namespace]` error into a notice
- Remove table dep for script main check
- Fix enum value parsing inside array initialization (fix #23937) (#23941)
- Fix the registration of fixed arrays, when size_expr is a const (fix #23946) (#23949)
- Disallow invalid expr in comptime `$for` (fix #23953) (#23959)

#### Compiler internals
- markused: fix `-skip-unused` on a short program, that prints array (fix #23436) (#23437)
- markused: fix `eprintln(err)` on imported module on short program (related: #23498) (#23499)
- markused: fix markused auto str detection (fix #23501) (#23503)
- markused: fix option ptr printing (fix #23559) (#23562)
- checker,markused: add identification for sumtype.type_name() call (fix #23732) (#23739)
- markused: improve stability (avoid runtime crash) when processing generic functions (partial fix for #23927)
- markused: fix markused behavior on array / map index getter / setter / slice (#23931)
- markused: fix markused behavior on struct field's default expression (fix #23909) (#23933)
- builder: do not search for msvc when it is not needed (#23386)
- pref: stop parsing CLI options, on encountering `--` (#23470)
- util: show `unknown command` suggestions, for more misspelled variants, like `v sefl`; make util.new_suggestion calls parametrizable
- pref: add Preferences.vroot_file/1 (done here, without using it, to ease the bootstrapping of the cheaders extraction, that will follow next)
- pref: fix panic in parse_args_and_show_errors, called with no args (fix #23713) (#23794)
- pref: allow for `-os wasm32_emscripten` and filtering `_d_wasm32_emscripten.c.v` and `_notd_wasm32_emscripten.c.v` files. (#23797)
- v.builder: show the last line of the C compiler output, in case of errors, in addition to the truncated first lines (the last line is useful, since it usually has an error counter)
- os,v.transformer: fix warnings for `./v -os cross -o vc/v.c cmd/v && clang-18 -o v_from_vc vc/v.c -lpthread`
- util: fix stack overflow during parsing of `#flag -DName=$d(...)` (#23895)
- builder: extract Builder.show_parsed_files/0 to make it easier to debug import/parsing issues
- builder: remove forgotten b.show_parsed_files/0 call
- util.version: centralise the use of `@VCURRENTHASH`, to minimise the vlang/vc diffs for each commit
- builder: support `-d trace_parsed_files`
- util: shorten the V paths used in the C `#line` directives with tcc (the ../../../.. etc is no longer needed with newer tcc) (#23974)

#### Standard library
- json: fix default struct field initialization with long array (#23355)
- markused,builtin,strconv,vlib: reduce generated C sizes for compilers != tcc, for short programs, by simplifying the generation of backtraces, and reducing string interpolations in panics (#23380)
- thirdparty/sokol: allow `-cflags -D_SGL_DEFAULT_MAX_VERTICES=4194304` to customize how many vertices you can send through gg/sokol in a frame
- crypto.ecdsa: expand ecdsa module, to support other curves like secp384r1, secp521r1, secp256k1 (#23407)
- crypto.ecdsa: fix memleaks, reported by the CI sanitizer jobs (#23450)
- ci: force the checking of changed vlib/crypto/ecdsa files with the sanitizer jobs
- builtin: add a `@[markused]` tag to `isnil()`, because cgen generates calls to it in some cases (#23462)
- builtin: reduce a bit the generated #if defined checks for small programs (#23484)
- crypto.ecdsa: improve safety checking, unify signing (and verifying) api to accept options (#23463)
- regex: fix misspelled word "firts" in replace_n description (#23514)
- os: add split_path/1: `os.split_path('/usr/lib/test.so') -> ('/usr/lib','test','.so')`; fix platform dependent behaviour of os.dir/1, os.base/1, os.file_name/1 (#23532)
- breaking,log: set stderr as default log output, add .set_output_stream() to allow for opting in the old default of stdout (#23444)
- builtin: add `-prealloc -d prealloc_memset -d prealloc_memset_value=65 -d prealloc_dump`, to better analyze the memory patterns of running V programs
- builtin: change the default builder size used for string interpolations, from 256 bytes to 64 bytes
- gg: mark create_image_with_size as deprecated (image resizing is done by `stbi.resize_uint8/3`, with a different fn signature) (#23580)
- crypto.ecdsa: split out the C wrapper to a new .c.v file (#23595)
- builtin: add &u8.free() (fix #23592) (#23598)
- crypto.ecdsa: fix bug in .with_no_hash handling (#23612)
- crypto.ecdsa: fix handling of sign() with custom_hash (#23619)
- runtime: add note for the availability of the free_memory/0 implementation (#23620)
- builtin: make public the `FnGC_WarnCB` alias (#23633)
- os: add disk_usage/1 (#23634)
- builtin: add string.split_by_space() (#23651)
- crypto.ecdsa: migrate `ecdsa.PrivateKey.new()` to use a high level API (#23640)
- gg: fix incorrect Event.mouse_x and Event.mouse_y on gg.Context.event_fn and gg.Context.on_event on HiDPI displays (#23668)
- crypto.ecdsa: migrate generate_key and simplify it (part 3) (#23662)
- encoding.csv: add support for multithreading to `encoding.csv.RandomAccessReader` (#23677)
- v.builder: add` os.quoted_path()` to os.system calls using v.pref.out_name, for the compress flag (fix #23685) (#23686)
- time: reduce chances of failures on the CI, by time_test.c.v; make the failure diagnostic easier
- time: improve the robustness of time_test.c.v (check if the diff is within ±1 second of the current timezone difference)
- crypto.ecdsa: migrate core routines for signing (and verifying), it now requires using OpenSSL 3 (#23705)
- all: use arguments() instead of os.args in some files
- math.big: fix 1/115792089237316195423570985008687907853269984665640564039457584007908834671663 leading to panic (fix #23771)
- v.cflag: support `#flag $when_first_existing(libABC.a, /some/path/libABC.a, ...)`, without panicing (unlike `#flag $first_existing(...)`) (#23780)
- term: add more comments in vlib/term/README.md
- log: fix panic on mutex destroy, when exiting a program, while a thread is still logging
- log: fix valgrind_test.v failure
- math.vec: add `rotate_around_*` (cw/ccw) functions to `vec.Vec2[T]` (#23807)
- math.big: bump newton_division_limit to 1_000_000 (workaround issue #23806)
- math.big: add vlib/math/big/big_division_test.v (follow-up to 270941a)
- strconv: fix strconv.atof64() inconsistency with the other .ato functions; make it return an error by default, when it detects an extra non number character after a number (#23815)
- os: add File.write_u8/1 and File.read_u8/0 helper methods
- ci,os: fix bootstrapping with `-os cross -o vc/v.c` (avoid the generic calls in the new write_u8 and read_u8)
- log: remove the notice about the stdout -> stderr migration (#23837)
- veb: fix "error parsing request: io.Eof" when expecting a request body, but the data is not ready yet (fix #22464) (#23842)
- json: fix json.decode autofree codegen (fix #23834) (#23839)
- time: add .week_of_year() method for time.Time instances (#23838)
- time: add documentation for remaining time-related functions and ISO 8601 parsing (#23867)
- crypto: add missing doc comments for public methods (#23864)
- builtin,os: fix warnings for `./v -os cross -o vc/v.c cmd/v && cc -o v_from_vc vc/v.c -lpthread`
- crypto.ecdsa: migrate new_key_from_seed to use high opaque, simplify the logic (#23876)
- math: fix `./v -prod -cstrict -cc gcc-11 vlib/math/math_bench_test.v` (use unions to implement f64_bits/1 and f64_from_bits/1 for compilers != tcc)
- crypto.ecdsa: complete the migration to the newer OpenSSL APIs (follow up to #23876) (#23877)
- x.json2: add a convenience Any.as_map_of_strings/0 method
- cli: add missing struct members to str() method and fix some comments (#23893)
- crypto.ecda: improvement the performance of `PrivateKey.new` by avoiding match+assignments (#23899)
- crypto.ecdsa: improves internal function of `calc_digest_with_evpkey` (#23901)
- crypto.aes: fix notices about order of operations (fix #23898) (#23902)
- Revert "math.bits: port changes from e66e996, so that `-cstrict -cc gcc-11` passes for `markdown` as well"
- crypto.ecdsa: improve the performance of the `.public_key` method of `PrivateKey` (#23920)
- gg: add is_key_down/1 helper method
- datatypes: optimize linkedlist (fix #23928) (#23934)
- x.json2: fix "\\" scanner bug, disallow (ch < 0x20) unescaped control characters (#23954)
- crypto.ecdsa: improve internal `sign_digest` routine (#23960)

#### Web
- veb: add `ctx.no_content()` + prevent content-type being set if the mime type is empty (#23425)
- net.ftp: use unsafe { nil }
- net.smtp: make public the Attachment fields (to be used as plain structs in initialisation) (#23477)
- x.vweb: remove the entire module (it's now veb)
- ci: fix failure of the docker-ubuntu-musl job (keep vlib/vweb/vweb_app_test.v in the skip_files)
- picoev: enable running veb services on Termux
- thirdparty: improve `-cstrict -cc clang-18 -prod` compatibility for programs that do `import net.mbedtls`
- net.http.file: use urllib decode uri, to handle urls to files that have unicode characters in their name (fix #23683) (#23684)
- veb.csrf: do not print anything by default, add an `verbose: true` option, to restore the old behavior if needed (#23725)
- net.unix: make unix_socket_test.v trace its actions more thoroughly
- veb.request_id: new middleware that implements request ID tracking (#23727)
- veb: update the blog tutorial
- net.openssl: use proper library search path for local installations of OpenSSL 3, use `SSL_get1_peer_certificate` instead of the deprecated `SSL_get_peer_certificate` .
- ci: fix vweb_run_at.run.out and vweb_run_at.skip_unused.run.out, ensure stable ordering of stdout/stderr for `v run file.v`, in case of compiling a program with warnings/notices.
- veb: handle sendfile errors, when the connection is canceled, before the file is completely transferred (#23891)

#### ORM
- orm: fix codegen for option fk (fix #23383) (#23400)

#### Database drivers
- db.sqlite: add tracing for more calls, when using `-d trace_sqlite`, not just for the ORM
- db.pg: add support for prepared statement, with db.prepare/3 and db.exec_prepared/2 (#23442)
- db.mysql: add SSL support; turn ConnectionFlag into `@[flag]` (#23975)

#### Native backend
- native: fix convert_int_to_string, add comments in the verbose (-v) mode (#23743)
- native: fix int prints (#23747)
- native: for statement : add support for all expressions handled by g.condition (#23752)
- native: fix inc and improve support for i32 (#23753)
- native: support negative integer literals (#23755)
- native: fix missing symbols CaptureStackBackTrace and __debugbreak (#23765)
- native: fibonacci test
- native: add support for enums of different types (#23786)
- native: fix unsigned and signed int comparison (#23808)

#### C backend
- Fix type_default for option type, when the default expr is `none` (fix #23318) (#23320)
- Remove double string cloning (#23331)
- Fix type_default for array init >= 8 items (spotted while building the vhamll project) (#23334)
- Fix codegen for alias struct embed (fix #23347) (#23353)
- Fix codegen for sumtype casting on selector on as cast with non pointer field (fix #23387) (#23391)
- Fix generic alias option assigning (fix #23382) (#23393)
- Fix codegen for selector on shared var with embed (fix #23378) (#23394)
- Fix codegen for nested selectorexpr on unwrapped option (fix #23406) (#23409)
- Cache return_stmt()'s node.exprs[0] and node.types[0] (#23408)
- Fix codegen for indexing generic map (fix #23376) (#23402)
- Support `-d trace_unused_by_main` and `-d trace_skip_unused_just_unused_fns`, to find out potentially obsolete functions that are not used at all in a project
- Fix shared array indexing (fix #23410) (#23413)
- Fix shared array fixed initializing with `-cstrict` (fix build of chip8-v project) (#23414)
- Fix codegen for array fixed comparison on MatchExpr (fix #23403) (#23415)
- Fix struct init for anon struct field on C structs (fix #23421) (#23422)
- Fix shared array slice (fix #23426) (#23427)
- Fix array of sumtype initialization with var string (fix #23429) (#23432)
- Fix codegen for ifguard indexing array of option (fix #23438) (#23439)
- Fix assigning option of array index (fix #23451) (#23455)
- Fix compilation for a project using a lot of json, threads, embeds + parallel-cc (#23467)
- Fix cgen error for `instance.t.wait()` on default 0 initialized thread field `t` (fix #23390) #23392
- Fix array decomposing on variadic call (found while working on solving #23474) (#23476)
- Fix option var nested unwrapping from sumtype (fix #23478) (#23485)
- Fix option unwrapping on heap var (#23489)
- Fix codegen for indexing anon_fn (fix #23493) (#23495)
- Fix nested option selector unwrapping (fix #23500) (#23497)
- Fix interface casting in anon fn (fix #23530) (#23533)
- Fix codegen for spawn with interface on submodule (fix #23471) (#23517)
- Parser,ast,cgen: support nested unions with `field union {`, to improve interoperability with C (similar to `field struct {`) (#23539)
- Fix unwrapping option interface field (fix #23540) (#23541)
- Fix codegen for assign from unsafe fn returning fixed array (fix #23546) (#23548)
- Fix codegen for a fixed array init with different node types (fix #23545) (#23547)
- Fix return on last statement of return IfExpr (fix #23550) (#23551)
- Fix auto str which expects ptr for ptr type (fix #23552) (#23553)
- Fix codegen for assigning from infixexpr with generic operand (fix #23560) (#23561)
- Fix codegen for array's .grow_cap and .grow_len methods for generic arrays (fix #23566) (#23568)
- Fix codegen for const fixed array initialization with another const as item (fix #23565) (#23572)
- Fix codegen for unwrapping option comptime var (fix #23590) (#23591)
- Fix hash functions for `map[Enum]Value`, and `enum Enum as u64 {` (fix #23630) (#23632)
- Fix unwrap option ptr selector (fix #23631) (#23638)
- Fix codegen for `for` or-block (fix #23625) (#23644)
- Fix codegen for option value on `map_set` (fix #23650) (#23652)
- Fix codegen for option sumtype with option variant (fix #23653) (#23656)
- Remove commented code blocks using `if true {`
- Reduce interpolations when a method is not found in Table.find_method/2; merge rand.constants back to rand.v (#23660)
- Fix `$if typeof[T]().idx`, `$if typeof[T]().unaliased_typ` checking (#23665)
- Fix codegen for sumtype cast from option variants on map_set (fix #23654) (#23669)
- Fix codegen for a const assigned a fixed array, initialized with unsafe exprs (fix #23674) (#23676)
- Fix `@[sql: serial]` and `@[serial]` are not the same (fix #23346) (#23678)
- Improve support for `v -path bootstrap_alternative_backend/ run simple.v` (#23679)
- Fix codegen for array fixed on if and match expr (fix #23577, fix #23589) (#23682)
- Add support for a `#postinclude` directive
- Fix #preinclude, add test case for #postinclude too
- Fix codegen for returning an initialised fixed array (fix #23693) (#23700)
- Use `global_g.out << g.out` instead of `global_g.out.write(g.out) or { panic(err) }`
- Fix issues found with the stricter sanitizers in clang-18 on Ubuntu 24.04 (#23710)
- Fix codegen for nested if on return (fix #23723) (#23729)
- Fix sumtype smartcasted var as inherited var (fix #23716) (#23731)
- Fix map with an Enum as key type, with size < 4 bytes on tcc (fix #23714) (#23738)
- Fix codegen for match with sumtype ptrptr (fix #23776) (#23785)
- Fix aggregate var handling on match branch (fix #23768) (#23787)
- Fix gowrapper codegen for receiver ptrptr (fix #23798) (#23800)
- Fix regression, preventing the use of `-gc none -d no_main -no-builtin -no-preludes` to compile C style V programs
- Fix array fixed assignment for `@[keep_args_alive]` (partial fix for #23804) (#23805)
- Fix nested option fixed array (fix #23708) (#23845)
- Fix codegen for match on return (fix #23661) (#23851)
- Fix casting primitive type to alias, where option alias is expected (fix #23859) (#23860)
- Fix interface method list ordering to make test buildable with `g++` (fix #23701) (#23870)
- Make `./v -prod -cstrict -cc gcc-11 test vlib/math/` pass cleanly (workaround a problem in V's cgen, that -cstrict discovered)
- Fix codegen for global array passed as mut (fix #23873) (#23881)
- Fix msvc build filename, remove temp files (#23890)
- Improve the stability of generated code for auto string methods
- Fix codegen for array of anon struct (fix #23896) (#23907)
- Make sure to call the overridden `pub fn (mut a []string) free() {` method, NOT the generic `fn (a &array) free() {` one. (#23911)
- Fix generic container init (fix #23910) (#23912)
- Fix codegen for generic structinit and generic array return (fix #23916) (#23943)
- Implement alias operator overloading for generic struct parent type (fix #23965) (#23967)
- Add `T.key_type`, `typeof(expr).key_type`, `T.value_type`, `typeof(expr).value_type`, `T.element_type`, `typeof(expr).element_type` for getting `Map[K]V` and `[]T` types (fix #23914) (#23962)
- Builtin,markused,pref,cgen: improve markused for small programs

#### vfmt
- Fix formatting for an option array of anon structs (fix #23841) (#23844)
- Fix comment handling on ending of struct decl (fix #23947) (#23948)

#### Tools
- ci, vc: use the full V repo commit hash, when generating vlang/vc commit messages
- Support `v should-compile-all folder/`, where `folder/` contains project subfolders (containing v.mod files and multiple top level .v files)
- Improve `v should-compile-all .` with support for compiling .wasm.v and .js.v files; skip `module name` files, compile projects that have .glsl files
- Improve `v bug` report wording
- v.help: improve message formatting (#23363)
- Restore `emcc --version` diagnostic in `v doctor`, when emcc is present
- ci: fix `v -W build-tools` (#23368)
- ci: force all tools to build without warnings/notices in tools_ci.yml (#23371)
- Fix `v buf file.v`, when run in a folder != vroot
- Improve output of `v bug file.v`, fix `v bug /long/abs/path/file.v` too
- ci: make show_manual_release_cmd.vsh use a fixed weekly.YYY.WW format for the weekly release tags
- ci: make easier the debugging of the `docker-alpine-musl-gcc` job (#23399)
- vvet: fix for `v vet folder/` + new features (track long fns, empty fns and repeated code), enabled by the new -F and -r flags (#23405)
- v.help: add a message for `v help crun` (#23431)
- Make cmd/tools/vretry_test.v independent from the presence of git (fix issue #23398)
- ci: add compile_herolib.sh, use it to make sure it keeps working (related #23467) (#23469)
- ci: fix toml-module-pass-external-test-suites after the CI image runner upgraded jq to version 1.7, by downloading and using the release version of jq-1.6
- ci: fix failure of the check-markdown job
- vet: add an `-I` option to notice fns, with the potential to be inlined (#23534)
- ci: update last known good commit hash for herolib to ca8799af39228a5678a7be81128c5b0c342c9efc
- Make `v check-md .` print the actual length of lines too, when reporting errors/warnings about them (#23606)
- Restore previous behavior of `v download` (show progress on stdout, when it is connected to an interactive terminal; hide log stdout->stderr notice)
- ci: fix `CI=name ./v -d network test cmd/tools/vpm/` ; update the image runners in vpm_ci.yml (#23628)
- Add `v reduce program.v`, in order to make smaller reproductions (`rpdc.v` files), before filing cgen bugs (#23636)
- Add a small utility script `cmd/tools/vrun`, to make it easier to use .vsh scripts on systems, with `/usr/bin/env` still not supporting `-S`
- Describe a more direct way to use a `v run` shebang in cmd/tools/vrun
- Fix show_manual_release_cmd.vsh, use .strftime(%V) for calculating the proper default week number
- Improve the `v reduce` parser for functions, and add more loops to reduce more (#23694)
- Improve `v reduce` output; bump version, warn on failed string_reproduces/3, but continue to run (#23697)
- Fix warnings in `v reduce` (#23709)
- Move `cmd/tools/vdoc/doc` to `cmd/tools/vdoc/document`, so that it can be imported from other programs through `-path`, without conflicting with the top level `doc/` folder in the main repo (#23733)
- ci: avoid duplicating work by removing the remaining `-skip-unused` tasks, since that is the new default (#23746)
- ci: use distinct names for the jobs, for easier filtering/searching in the Github's UI
- ci: fix job names in cmd/tools/modules/testing/common.v as well
- ci: fix github job names in cmd/tools/vtest-self.v
- ci: update the remaining runners from ubuntu-20.04 to ubuntu-22.04 and ubuntu-24.04 (#23754)
- ci: rebuild V with `v -g self` in .github/workflows/native_backend_ci.yml, to improve remote diagnosis of panics in PRs
- ci: use `-silent` for the longer test runs (suppress most OK lines, to reduce scrolling on failure)
- .gitignore: ignore the project settings file for gf2 (a very nice GUI gdb frontend)
- vrepl: fix slow response for empty line input (after just pressing 'enter/return') (fix #23856) (#23858)
- Make `v repeat failing_cmd` show the error output *just once*, but also still measure the time it took to execute
- Add --check flag to `v ast` (#23938)
- Add `v timeout` to be able to later use `v timeout 5.1 git -C . fetch V_REPO` in `v doctor` and other tools.
- Add a custom timeout of 5s for the network using command `git -C . fetch V_REPO` in `v doctor` (it normally takes <1s) (fix #23955)
- Support `v doctor -skip-github` to fully skip the fetching step, in places that have limited connectivity (alternative fix/workaround for #23955)
- ci: use -silent in more jobs that produce a lot of OK lines normally (for test-cleancode, test-self, build-examples, build-tools)

#### Operating System support
- Avoid os.glob, in favour of os.walk_ext (which works consistently even on windows)
- gg: add linux support for `fn screen_size() Size` (fix #23146) (#23326)
- Define _GNU_SOURCE on Linux (#23364)
- Fix `v doctor` format, fixes for windows, tcc and others (#23361)
- picoev: fix for windows apps with veb in a thread, parallel to a webview, that opens a lot of file descriptors (#23492)
- v.pref: set `DYLD_FALLBACK_LIBRARY_PATH` on macos, when `-use-coroutines` is used, so that `v run` can work, and the executable can find the downloaded photonwrapper shared library (#23516)
- encoding.iconv: add flag for OpenBSD to find iconv include and library (fix #23573) (#23575)
- runtime: add free_memory/0 implementation for OpenBSD (fix #23579) (#23583)
- Fix `v doctor` output on OpenBSD: get gcc version from egcc; do not run ldd to get the glibc version (fix #23576) (#23578)
- make.bat: add note about antivirus programs on windows and compilation slowdowns (#23586)
- runtime: add free_memory/0 implementation for FreeBSD too (fix #23581) (#23594)
- log,sync: fix macos CI failure when log.ThreadSafeLog is used explicitly in `v download` (#23613)
- Let `v test .` show the running _test.v files each minute (set by `VTEST_REPORT_RUNNING_PERIOD_MS`); diagnose stuck windows gcc CI jobs (#23649)
- ci: run FreeBSD on a VM in github ci, instead of on the Cirrus service (which stopped working today) (#23692)
- cgen,builder: fix windows 32bit dll function name mangle (fix #23689) (#23690)
- ci: update linux image runners from `ubuntu-20.04` to `ubuntu-24.04` (#23706)
- ci: do not use `VJOBS: 1` in the windows tcc job anymore
- make: use .exe only on Windows
- ci: reduce the timeouts in windows_ci.yml to 60 minutes (V is now faster, and the runners use faster hardware as well)
- native: allow for searching for wine system32/ .dlls, and for adding more paths for .dll lookups, by setting `VNATIVE_PE_DLL_PATH`, to make it easier to diagnose problems with PE generation on non windows platforms (#23756)
- ci: skip fibonacci_native.vv on windows for now
- sync: support x86_64-alt-linux gcc paths too when tcc is used (needed for ALT Linux)
- ci: make freebsd_ci.yml runnable on personal forked repos, that are not named `v` (#23779)
- ci: remove the VJOBS=1 restriction for test-cleancode on linux (#23801)
- os: fix buffer overflow in os.get_raw_line under Windows (#23816)
- ci: move test in pe_test.v to native_test.v (both used `-b native`, competing the creation of the backend executable => CI failures on the gcc-windows job)
- Make `v install` avoid using `--filter=blob:none --shallow-submodules --also-filter-submodules` on windows (#23840)
- os: fix get_raw_line() on windows (fix #23843) (#23846)
- ci: add a limit of 20 minutes to the test-on-freebsd-14-2-x86 CI job
- Support `// vtest build: !do_not_test ?`, `// vtest build: !windows && tinyc` to skip files during testing on specific platforms, without having to keep centralised skip lists (#23900)
- cgen,dl: remove workaround in `dl`, generate a DllMain() in cgen instead for `-shared` on windows (#23961)

#### Examples
- Allow for passing arbitrary compiler flags to `v bug`, for example: `v bug -cg -autofree file.v` (#23335)
- examples,builtin,cgen,live: fix windows hot reload with `-cc tcc`, improve the infrastructure, use a V global instead of a C one (fix #23214) (#23350)
- Fix unused db.pg import warning for examples/database/psql/customer.v
- gg,sokol,examples: add example of overriding _SGL_DEFAULT_MAX_VERTICES in code
- Mention also the RAM usage increase in many_thousands_of_circles_overriding_max_vertices.v
- gg: enable clean compilation without notices for `./v -check-unused-fn-args examples/tetris/`
- Add vascii.v showing a table of the first 128 ASCII characters with their names and codes in dec, oct, hex, bin formats (#23466)
- Add a solution to the "1 Billion Row Challenge" (#23458)
- examples,io: add sha256sum_with_io_cp.v, make the size of the buffer used by io.cp parametrisable (#23585)
- log: add `log.use_stdout()`, use it to silence the transition note for the most commonly used V tools/examples (#23642)
- Implement an -s option for `v ast`, to skip all nodes with default values like [], {}, 0, false; with it `v ast -pts examples/hello_world.v | wc -l` is 36 lines
- gg: fix `./v -gc none -autofree run examples/tetris/` (avoid `return s1 + s2 + s3`, clone the arrays, passed to the fontstash wrapper)
- examples,gg: modify all remaining calls to fons.add_font_mem/3 to use an array.clone()
- Add examples/hot_reload/tunnel.v
- Add minimal_c_like_program_using_puts.v showing how to produce a much smaller executable on Linux, using clang, mold and sstrip.
- Build examples, that start with `module no_main` as well
- ci: fix `v build-examples` failure on gcc-windows
- Support `module no_main` based examples in `v should-compile-all`
- term: make the second example in the README.md compilable as well
- Show how to use a v file server for the wasm version of 2048, instead of emrun
- sokol: allow for `v -os wasm32_emscripten -o examples/tetris/tetris.html examples/tetris/` (avoid using `-sMODULARIZE`) (#23814)
- Fix poll_coindesk_bitcoin_vs_usd_rate.v, use the new v2 API endpoint
- math,examples: add examples/sokol/sounds/simple_sin_tone_using_audio_push.v, cleanup math
- Add a small breakout game, supporting keyboard and touch controls (#23861)
- Cleanup snek.v, by using `math.vec`, the builtin array support, instead of `datatypes`, and by removing casts that are no longer needed
- Fix `v -cstrict -cc gcc-11 examples/sokol/particles` and the same but with clang-18 too
- Fix more compilation errors with `-cstrict -cc clang-18` for the sokol examples
- Fix `VFLAGS='-no-skip-unused -cstrict -cc clang-18' v should-compile-all examples/sokol/` too
- Add a small minesweeper game in examples/gg/minesweeper.v
- Add a small Sokoban puzzle game with levels (see https://en.wikipedia.org/wiki/Sokoban)
- Use textures in the sokoban game, instead of colors
- Shorten the periodic output of examples/hot_reload/message.v
- Fix (ball->side edge of brick) collision detection in breakout.v
- Add subtle light and shadow effects to the breakout game, to give it a little depth (#23885)
- Run the update method of breakout on its own frame independent rate
- gg,examples: use a timer to limit the rate of updates in breakout, instead of a separate thread, restore ability to run in a browser through emscripten
- Make the tetris update rate, independent from the frame rate too
- Make the 2048 game update rate, independent from the frame rate as well
- Fix panic, discovered by fuzzing examples/2048/2048.v with zzuf on the CI
- Add `vanilla_http_server` - a fast, multi-threaded, non-blocking, port and host reuse, thread-safe, epoll server (#23094)
- v.build_constraint: support comments too, for example `linux&&gcc // some comment`
- Make `v repeat -R 5 -r 10 "v run examples/hello_world.v"` also show the time it took for all runs in each repeat
- Add an asteroids game (it is currently < 400 lines of V, using gg)
- Remove the generic alias type overloaded operator workaround, after 29e60da
- Fix `v should-compile-all examples/`


## V 0.4.9
*22 Dec 2024*

#### Improvements in the language
- `-skip-unused` is now on by default resulting in much smaller cgen and binaries. 70% reduction for hello world.
- `-parallel-cc` for speeding up `-prod` and `-cc clang/gcc` compilation by up to 14 times!
- C functions no longer need to be manually defined. An `#include "foo.c"` is enough (behind `-experimental` for now).
- Fixed arrays now have `.index .any .all .map .sort .sorted` methods
- Remove inline sum types completely
- Support `in` expr with number ranges: `if var in 1..4 {` (fix #20352) (#22754)
- Optimize literal string comparison (`match`, `in` and `==`) (#22643)
- Allow `map[k]()?` and `map[k]()()` (#22740)
- Add selector option unwrapping inside `if tree.root != none {` (#22895)
- Add `array.count` as a method that accepts a predicate, similar to filter, but returning just the number of matches (#23054)
- Allow option array element comparison `==` and `!=` (fix #23108) (#23113)

#### Breaking changes
- time: rewrite parse_rfc3339/1 to improve performance, reject partial timestamps, that miss date info like `22:47:08Z` (#22585)

#### Checker improvements/fixes
- Optimize identical type checking (#22596)
- Fix `T.unaliased_typ` if branch evaluation (fix #22587) (#22598)
- Fix lambda expr with fntype params and restore fixed_array_any_all_test.v (#22625)
- Check fixed array builtin method args mismatch (#22626)
- Fix generic fn call return type resolve on var assignment (fix #22612) (#22627)
- Improve checking parameter mismatches for fixed array builtin methods (#22630)
- Add tests for checking the new errors for fixed arrays .sort() calls (#22656)
- Fix index expr that left is if expr (fix #22654) (#22661)
- Fix return type checks, when returning struct values, implementing IError in non-result fn (fix #22659) (fix #22658) (#22660)
- `App.method` field initialisation, for fn fields, initialised with generic methods (#22665)
- Allow for `f() or { T{} }` in a generic method, for `fn f() ?T {`, being called with `T`, being a container like []int etc, not just a primitive type like int (#22672)
- Allow for `f() or { T{} }` part 2, see also cc55aa5 (handle the case of an ignored result as well) (#22687)
- Fix selector with prefixed `&` structinit (#22689)
- Fix missing check for fn var with generic return inherited to anon fn (fix #19045) (#22683)
- Check for receiver name clashing with global var (fix #22698) (#22708)
- Fix none check for match expr with option (fix #22728) (#22732)
- Fix option map fn type and missing check for result param type (fix #22736) (#22738)
- Fix missing info about generic fn var usage without concrete types (fix #22733, #22734) (#22743)
- Fix missing check for stack pointer return (fix #22726) (#22756)
- Improve static method call resolution (fix #22773) (#22787)
- Skip redundant message for int overflows, while casting integer literals (fix #22761) (#22788)
- Fix callexpr after auto C func identification (fix #22800) (#22809)
- Fix missing auto `from_string` type restriction (related to #22783) (#22803)
- Fix match expr with empty array init expression (#22832)
- Disallow `foo[T]` as a value  (#22820)
- Fix if expr with empty array init expression (related #22832) (#22841)
- Improve the position underlining, for last statements in branches of `if` expressions  (#22845)
- Fix generic fn call with empty array argument (fix #22843) (#22846)
- Fix missing or-block check for callexpr (fix #22835) (#22840)
- Check array builtin method calls, that do need a mutable receiver, but are called on an immutable one (fix #22850) (#22853)
- Check alias of array op overloading and fix op overloading (fix #22851) (#22854)
- Disallow struct init with `mutable_field: const_array` (fix #22862) (#22863)
- Check struct aliased field unsign type assigning negative value (fix #22868) (#22871)
- Fix alias to struct generic type (fix #22866) (#22872)
- Fix `json.encode_pretty` with a struct init expression argument (#22897)
- Fix codegen for fixed array initialization with a fn call (fix #22887) (#22891)
- Fix or-expr check on invalid method call (fix #22949) (#22950)
- Fix mut var option unwrap with `!= none`, support `if mut x != none {` too (fix #22936) (#22943)
- Prevent a compiler panic, while running `v -check file.v` on files with parser errors (fix #22981) (#22982)
- Allow array sort with callexpr (#22989)
- Fix `$res()` used in `defer {}` blocks with more statements, add a test (#22998)
- Fix generec fn returning generic closure (#23047)
- Fix generic fn returning generic closure (related #23047) (#23055)
- Fix missing checker for cast from mut var to non-ptr type (fix #23017) (#23056)
- Check fn call argument mismatch (fix #23016) (#23061)
- Fix empty array append multi dims (fix #23092) (#23096)
- Fix selector generic or block (fix #23088) (#23102)
- Fix veb route method param with non ctx name (fix #23105) (#23107)
- Allow fixed array where voidptr is expected (fix #23090) (#23100)
- Fix immutable to mutable reference (fix #22653) (#22663)
- Fix missing check on range expr when high var is same iteration value var (#23130)
- Allow `[]Enum{len: 10, init: .thing}` (fix #23077) (#23165)
- Fix option unwrapping and call from option struct field (#23182)
- Add a notice for global variable redeclarations (#23162)
- Fix assign check, when rechecking for another concrete type (#23212)

#### Parser improvements
- Fix generic struct init detection `T{}` (#22682)
- Improve the assert informations (related #22668) (#22679)
- Make C struct fields public and mutable by default (fix #22695) (#22706)
- Fix enum redeclaration error (fix #22759) (#22766)
- Fix struct field name using keyword (fix #22826) (#22829)
- Optimise mark_var_as_used calls, by moving it to an ast.Scope method (#22842)
- Optimize method parameter detection in used check (#22915)
- Fix block position's last line (#22913)
- Support `@[must_use]` tag for fns/methods, and an experimental `-check-result` option (#22983)
- Allow `type` as field type on params struct construction (fix #23091) (#23098)
- Allow `type` and other keywords as plain attr value (fix #23150) (#23154)
- Support `@[tag]` for hash statements, like `#define` and `#flag` (#23210)

#### Compiler internals
- Add `:parse_text` to the paths of .v files, printed by `-print-v-files`, for parse time generated snippets
- v.pref: support a `_wasm32_emscripten.c.v` suffix for platform files too
- builder: fix msvc build thirdparty obj file from .cpp (fix #22772) (#22789)
- v.util: use temporary workaround for the vinix build problem (when VFLAGS is set, and `-ldflags ` is passed at the same time)
- Allow getting notified about unused function params (#22879)
- v.scanner: remove `Scanner.is_started` field (#22918)
- v.scanner: fix string interpolation for float e format (fix #22429) (#23147)
- cbuilder: remove flto with parallel-cc, it slowed down linking 10x
- cbuilder: store split up C files in vtmp
- v.builder: integrate more compile/linker options into parallel_cc.v (#23190)
- v.builder: prevent passing `-x objective-c` with `-parallel-cc` for now
- v.builder: move filtering logic for `-parallel-cc` to parallel_cc.v
- v.pref: support `-debug` and `-cdebug`, as more explicit alternative names for `-g` and `-cg` (#23208)
- v.builder: fail the whole v compilation, if linking or compiling during `-parallel-cc` fails (#23211)
- v.pref: implement `-no-prod-options` to turn off passing `-O3 -flto`, while still keeping the `$if prod {` branches (passing custom flags with `-cflags -Os` already works)
- v.builder: support `-no-prod-options` with `-cc msvc` as well

#### Standard library
- builtin: improve performance of `string.starts_with/1` and `string.ends_with/1`, when compiled with tcc (#22620)
- builtin: improve `fixed_array_any_all_test.v` (related #22609) (#22621)
- builtin: temporary fix fixed_array_any_all_test.v (#22624)
- builtin: support `-d no_gc_threads` for turning off passing `-DGC_THREADS=1` while compiling the GC library
- encoding.utf8: fix is_punct func (fix #22646) (#22647)
- log,time: improve performance for writing a line to a log, add Time.format_rfc3339_micro/0 (#22662)
- flag: add missing short flag match in `flag.to_struct`, add test (#22696)
- bitfield: add `shift_left/1` and `shift_right/1` methods to `BitField` (#22700)
- x.json2: pre-arranging the replacement of the decoder, to match https://github.com/enghitalo/v/tree/decoder2_to_json2 (#22729)
- builtin: improve fixed_array_any_all_test.v (#22746)
- builtin: add `string.is_pure_ascii()` (#22748)
- os: document the various enum values in os.Signal (#22770)
- builtin: fix runes.to_upper() (fix #22742) (#22755)
- ci: use os.system to redirect output
- vlib: initial addition of `x.encoding.asn1` (#22783)
- os: work towards being able to again use `-autofree` while recompiling the V compiler several times
- x.encoding.asn1: fix time creation to also accommodate negative timezone offsets (#22861)
- vlib: remove modules/functions/fields, deprecated in 2023 (#22750)
- term: improve performance of repeated can_show_color_on_stdout and can_show_color_on_stderr calls, by caching their results (#22893)
- builtin: make int_min/2 and int_max/2 public
- json: mark json_print_pretty/1 with `@[markused]` (used by cgen)
- math.big: use `@[manualfree]` to workaround -autofree compilation issues with gitly, and other projects using `crypto.rand` and `math.big`
- x.encoding.asn1: improve performance (#22948)
- gg: use a larger fontstash text atlas by default (2048x2048, and customizable), instead of 512x512 (fix #21610) (#22959)
- Revert "os: deprecate `os.getwd` in favor of `os.get_current_dir` (part 1) (#22966)"
- log: tag log.fatal with @[noreturn] (#22986)
- runtime: force runtime.nr_jobs() to return 1, while V is bootstrapping itself, from vc/ source, that was compiled with `-os cross` (fix #22991)
- json: fix decode codegen for []&type (fix #23007) (#23010)
- os: add os.get_trimmed_lines() too
- crypto.sha3: add support for Keccak-256 and Keccak-512 (#23058)
- rand: add missing i32 APIs, corresponding to the int ones
- math.big: fix `assert big.integer_from_int(1) == big.integer_from_bytes([u8(0), 0, 0, 0, 1])` (fix #23115) (#23124)
- math: use libc wrappers for math.log2/1, math.log10/1, math.log1p/1 and math.log_b/1; make `assert math.log10(10) == 1.0` pass in the common case (#23129)
- gg: add `icon` field to gg.Config, for easier access (fix #23135) (#23138)
- math: fix math.log10() for `-exclude @vlib/math/*.c.v` (fix #23136) (#23140)
- json: add primitive type validation (fix #23021) (#23142)
- json: fix memory leak on result messages (checked with `json_option_raw_test.v`, compiled with `-fsanitize=address,pointer-compare,pointer-subtract`) (#23172)
- vlib: add new `rand.cuid2` module (#23181)
- json: fix memleak on sumtype decoding (#23197)
- vlib: enable more satnitized memleak detection runs without false positives on the CI (#23200)
- json: fix argument freeing for json.encode and json.encode_pretty calls (#22781)

#### Web
- veb: translations via %translation_key
- picoev,net.http: use Time.http_header_string method, to improve performance (#22619)
- Do `import veb`, only for templates that do use functions defined in `veb`
- picoev: support `-d picoev_verbose_errors`, do not use any naked `eprintln` by default, since that is a low level module
- picoev: fix the incompatible pointer type cast error in the C.epoll_wait call (#22785)
- net.mbedtls: define MBEDTLS_THREADING_PTHREAD, in mbedtls_config.h; call C.mbedtls_ssl_conf_read_timeout explicitly in the wrapper, with a shorter timeout value of 317ms (determined experimentally)
- veb: fix large file transfer timeout (fix #22489) (#22924)
- net.http: send Host headers with port (when the port is != 80 or 443) (fix #22941) (#22942)
- net.mbedtls: support compiling with `-d mbedtls_client_read_timeout_ms=7000`, `-d mbedtls_server_read_timeout_ms=60000`, and `-d trace_mbedtls_timeouts`
- net.urllib: fix parse of url relative address (fix #21061) (#23180)
- veb: fix key value and translation file name (#23203)

#### ORM
- Fix orm.Connection only allowing immutable Connections (#22684)
- Fix order by with custom column name (#22813)
- Support plain `@[serial]` attribute for marking struct fields (#22814)
- Fix crash when working with array field (fix #22822) (#22824)
- Fix list generation and escape loose backtick (#23039)
- Fix mark as used var on insert statement (fix #23032) (#23038)
- Fix update stmt with enum value (fix #23031) (#23037)

#### C backend
- Fix codegen for fixed array contains - `[1,2]! in a` (fix #22559) (#22579)
- Improve fixed array literal in operation and index calls (#22590)
- Add codegen for auto free methods for interface type (#22555)
- Add test for #22586 (#22600)
- Parser,ast,cgen: do is_builtin sym marking during parse time just *once*, to save multiple checks later (#22580)
- Cache the results of g.base_type/1 (#22613)
- Add caching to contains_ptr return (#22605)
- Add .write2/2 and .writeln2/2 methods to reduce consecutive write calls (#22610)
- Optimise the generated code for returning literal values and option/result values (#22622)
- Optimize literal string comparison (string__eq -> vmemcmp) (#22614)
- Fix selector indexexpr with fntype on assignment (fix #22635) (#22637)
- Fix anon fn with `&` prefix (fix #22628) (#22638)
- Fix struct field init with fixed array using index (fix #22616) (#22641)
- Fix interface conversion codegen race issue (fix #22640, #17943) (#22655)
- Fix waiter funcs declarations (fix #22640) (#22649)
- Improve the assert informations (fix #22666) (#22668)
- Fix dump of alias to option fn type (fix #22670) (#22676)
- Fix array append map value with or expr (fix #22674) (#22678)
- Ensure proper saving/restoring of cgen `map[k] := fn ()` state, when assigning anonymous fns (fix #22705) (#22707)
- Implement methods sort_with_compare()/sorted_with_compare() for fixed arrays (#22702)
- Implement methods reverse()/reverse_in_place() for fixed arrays (#22712)
- Fix ptr field encoding for `json` (fix #22717) (#22720)
- Fix `[1, 2, 3]!.map(it * 2)` (#22722)
- Fix `assert [1, 2, 3]!.contains(2)` (#22725)
- Fix `assert [1, 2, 3]!.index(2) == 1` (#22727)
- Fix spawn with non-pointer receiver (fix #22718) (#22719)
- Fix `assert [1, 2, 3]!.reverse() == [3, 2, 1]!` (#22745)
- Fix codegen for `-no-builtin` flag (when used separately from `-d no_main`) (#22765)
- Apply the `a in [x,y,z]` optimisation for `ast.IndexExpr` and `ast.SelectorExpr` again (#22767)
- Fix codegen to emit callexpr one time for `in` expr optimization (#22764)
- Fix c codegen formatting for return match (#22768)
- Avoid generation of empty `or` blocks for `f() or {}` (#22775)
- Fix struct field name using c keyword `typeof` (fix #22779) (#22782)
- Remove unused code generated for unwrapping temp var from callexpr (detect unused return value from CallExpr), fix parser bugs (#22769)
- Enable if guard to add `err` var on else branch, after last `else if` (fix #22784) (#22786)
- Fix option struct default value init with `-cstrict` (spotted in #22783) (#22802)
- Fix codegen for fn fixed array param w/ size defined by const (fix #22811) (#22812)
- Fix wrong type resolution on infix (#22804)
- Fix default `T{}` when `T` is ref type + dereferencing issue when comparing int alias to int (fix #22795) (#22807)
- Fix generation of a missing return in `return if cond { x } else { return missing }` (fix #22838) (#22839)
- Fix generic static method call return type resolution (#22865)
- Fix array fixed code generation for more than 1 dimension (fix #22866) (#22876)
- Fix codegen for `$if` in an if expression, when compiled with `-g` (fix #22873) (#22888)
- Make errors more informative (resolve empty panics) (related: #21184) (#22898)
- Generate json array line on uniform indent lvl (#22899)
- Fix codegen for returning a fixed array as a result (fix #22894) (#22896)
- Fix codegen for alias type interface methods (fix #22901) (#22902)
- Fix codegen for assigning aliased fixed array (fix #22907) (#22909)
- Fix codegen for returning option aliased fixed array (fix #22910, fix #22911) (#22912)
- Fix aliases of fixed array infix expression (fix #22925) (#22928)
- Fix aliases of fixed array append to array (fix #22926) (#22929)
- Fix option unwrap for fields of interface type (fixes #22930) (#22931)
- Fix aliased fixed array option fn call (fix #22927) (#22934)
- Move the `msvc compiler does not support inline assembly` to cgen (so it will only get triggered, when ASM blocks are still present, in what is passed to cgen)
- Fix dump fixed array on array append (fix #22935) (#22940)
- Fix enum value string interpolation, like its declared enum underlying type (fix #22938) (#22945)
- Allow unwrapping of `x as string` expr, when `x` is a `?string` value (#22953)
- Fix codegen for result/option propagation out of fn context (fix #22961) (#22963)
- Fix codegen for option on concatexpr (fix #22951) (#22964)
- Reduce code for returning and extra whitespaces on `return` (#22967)
- Allow unwrapping of `foo.bar as string`, where `foo.bar` is `?string` (fix #22960) (#22973)
- Add thread timing stats too, on `-show-timings -stats` (#22990)
- Patch missing `gettid()` on glibc < 2.30 (#22987)
- Fix array fixed on update expr and alias type to multi dimension of fixed array (fix #22971) (#22972)
- Fix sumtype with embedded struct of option field (fix #22984) (#22996)
- Fix autostr for interface with circular type (fix #23022) (#23026)
- Fix array.delete_many() codegen (fix #23024) (#23025)
- Fix callexpr or-expr codegen on const decl (fix #23029) (#23043)
- Fix struct update embed expr for fixed arrays (fix #22999) (#23040)
- Fix update expr with embed fixed array with multiple dimensions (fix #23048) (#23049)
- Fix cast interface value in match expr (#23068)
- Prevent too long lines in array initialisations (#23074)
- Fix smartcast codegen for msvc (#23084)
- Fix option codegen for accept IError value (fix #23076) (#23085)
- Fixed for in loop with generic fixed array (fix #23075) (#23101)
- Fix printing fn call of returning c struct value (fix #23104) (#23106)
- Fix array fixed comparison from fn return (fix #23071) (#23114)
- Fix array map to fixed array (fix #23116) (#23118)
- Fix codegen for returning different option alias type (fix #23087) (#23125)
- Fix for in for interface type (fix #23119) (#23127)
- Fix codegen for generic selector expr (fix #22974) (#23132)
- Fix different option alias type as fn arg (fix #23086) (#23131)
- Fix codegen for returning option reference from indexexpr (fix #23133) (#23139)
- Fix array fixed auto str on `-cstrict` (#23144)
- Fix codegen for array append on indexexpr (fix #23156) (#23160)
- Fix assert for alias to fixed array (fix #23149) (#23161)"
- Fix auto eq for fixed array (fix #23149) (#23169)
- Fix fixed array option cast with `none` (fix #23164) (#23168)
- Fix selector call with reserved c name (fix #23170) (#23175)
- Parser,checker,cgen,fmt: fix array fixed option initialization (`none`) (complete #23164) (#23176)
- Fix option fn with voidptr arg (fix #23170 for !=tcc too) (#23179)
- Fix missing validation for selector unwrapping + fix default `return none` for unwrapping (#23183)
- Fix assign optional aliases of fixed array (fix #23185) (#23188)
- Fix struct field init with optional fixed array (fix #23193, fix #23195) (#23199)
- Reduce RAM usage, by avoiding a .str() call, for the final string builder, containing the final C program, used to write it to a file (#23226)

#### vfmt
- Add support for comments inside `sql db { ... }` blocks (fix #22601) (#22602)
- Fix formatting fixed array size of struct member (#22815)
- Fix formating non-unsafe blocks with break line (fix #22900) (#22903)
- Fix shared receiver formatting (fix #23151) (#23153)

#### Tools
- ci: add benchmark_footprint_json_decode.yml and benchmark_footprint_json_encode.yml (#22592)
- Use a `~same~` label, when the results in `v repeat` are not different enough
- Allow for fast exiting in compare_pr_to_master.v through Ctrl-C (or any failed command)
- ci: fix failing jobs after 4ed9d13 (#22606)
- Discard the top 7 results for each 10 runs, from `v repeat` runs, done by compare_pr_to_master.v, to reduce σ on machines with more varied load
- Allow for `v repeat -N ./cmd/tools/vtest_test`, by adding a -N/--no_vexe_reset option to `v repeat`
- Show more details in compare_pr_to_master.v
- ci: fix failing musl jobs after 2684ef9 (#22667)
- ci: run `zizmor .github/workflows/paths_ci.yml` and fix reported issues (#22681)
- Show the full test output, on known flaky test failure with `v test folder/` (#22716)
- Change `v test` to allow for `// vtest hide_retries` so that retry_test.v can hide its own (deliberate) retries
- ci: rename one of the duplicate `main_test.v` files, to reduce false positives (workaround)
- Fix `v doctor` output for missing `cc`. Add a diagnostic line checking for `emcc --version` too
- ci: run `v fmt -w vlib/v/pref/should_compile.v`
- ci: reduce flakyness of cmd/tools/vcover/cover_test.v (workaround for a race condition while updating the OK tasks counter in `v test`)
- Improve the diagnostic output of compare_pr_to_master.v
- ci: add a problem matcher support, to get error/warning/notice annotations in V CI jobs (#22790)
- Bump default `v retry` timeout to 10 minutes, clarify the usage of its `--timeout` option.
- ci: fix Build V
- ci: silence compilation warning for bench_string_key_in_map_vs_string_value_in_array.v
- ci: fix vinix_ci.yml for latest Vinix commits (#22818)
- Improve output of compare_pr_to_master.v
- Use `v retry` in more places, that do network operations that can fail temporarily (#22836)
- Allow for `v download -RD URL/script.vsh`, to download `script.vsh`, then run it locally, then remove it, in a single command
- v.help: add topic for `v help retry`
- v.help: add help topic for `v help repeat`
- ci,v.help: work around -autofree bugs, fix `./v -autofree -o v2 cmd/v`
- ci: add .yml file for testing compilation of Larpon's Shy library and the Puzzle Vibes game (#22874)
- ci: check more compile flag combinations in puzzle_vibes_ci.yml
- Fix compilation of hw with vnew -> vold, in compare_pr_to_master.v
- ci: fix for `v build-tools`
- ci: check that more apps/modules do compile with -skip-unused (#22904)
- vet: make `v vet` produce a nicer note, including the offending files, instead of `file.v` (#22957)
- ci: extract the VTL&VSL jobs from v_apps_and_modules_compile_ci.yml to vsl_and_vtl_compile_ci.yml
- Make oldv aware of when to pass -no-parallel when bootstrapping V from v.c (fix #22990, part 2)
- markused: only add .vtest_ functions, *when* compiling _test.v files (#23003)
- Improve oldv compatibility for using new stricter C compilers like clang-18, to compile older V versions from 2020 and 2019
- Use -Wno-error=incompatible-pointer-types in oldv, which is more permissive than just -Wno-error=incompatible-function-pointer-types, and works with gcc too, not just clang
- Describe more precisely what commands are used by `oldv`, so it can fail early, with a meaningful error message, if they are not present.
- ci: fix ROADMAP.md checks (#23059)
- vrepl: shrink .repl inputs, so repl_test.v runs faster
- ci: update compile_v_with_vtcc.sh, enable its CI task again (#23063)
- ci: extract .github/workflows/compile_discordv.sh, enable its CI step again
- json2.decoder2: prepare decoder in json2 to be replaced by json2.decode2 (#23078)
- Let oldv fail early, when git fails to do network operations or checkouts
- ci: fix for `-cc tcc -no-retry-compilation`, do not use more complex constants, but functions in vlib/math/vec/vec2_test.v
- ci: fix option_fn_voidptr_test.v after a200c45
- ci: make the CI more robust, by retrying commands and `v download` instead of wget (#23196)
- ci: use `v retry -- v setup-freetype` to make the CI more robust against random network failures
- ci: change exec name for parallel cc
- ci: speed up again sanitizer runs (#23222)

#### Operating System support
- builder: change linuxroot repo URL to https://github.com/vlang/linuxroot
- ci: test -os linux cross compilation on macOS
- ci: test the cross compilation from macos to linux sooner, show more information
- ci: move the macos->linux check even higher, to make easier testing and diagnosing linuxroot update failures
- orm: cross compile pg to linux; openssl: make cross compile work
- ci: use `macos-14` instead of `macos-12` because of https://github.com/actions/runner-images/issues/10721
- ci: macos_ci.vsh
- ci: fmt macos_ci.vsh
- ci: use thew new macos_ci.vsh (github)
- ci: improve output of macos_ci.vsh
- ci: extract `ci/common/runner.v`, use it to simplify ci/macos_ci.vsh even more
- ci: fix spurious failures for printing_struct_with_thread_field.vv on windows
- net.http: ensure that http.download_file_with_progress/3 works (in a degraded mode), on windows, even without passing `-d no_vschannel`
- builder: fix cross compiling from linux to windows, when passing -g/-cg
- docs: update the documentation of the @[console] tag, add advice to use `-subsystem windows` instead
- Make compare_pr_to_master.v use /opt/homebrew/bin/gtime on macos, and a pure V fallback, not just for windows
- ci,thirdparty: enable MBEDTLS_THREADING_PTHREAD and MBEDTLS_THREADING_C only on Linux for now (fix windows CI)
- thirdparty: enable MBEDTLS_THREADING_C and MBEDTLS_THREADING_PTHREAD on FreeBSD too
- os: use _wputenv instead of _putenv to stay in sync with _wgetenv (fix changing env variables with non ASCII content on windows) (#22920)
- ci: avoid false positives for the existing PRs, by comment out the task `V self compilation with -usecache` on macos for now (#23145)
- ci: linux_ci.vsh; cgen: parallel-cc fixes
- ci: remove extra EOL from linux_ci.yml (#23187)
- Fix profile time on windows  (#23227)

#### Comptime
- Add `typeof(var).indirections` and `T.indirections` (#22805)
- Add `typeof(expr).unaliased_typ` (#22806)
- Allow sumtype init by variant comptime var `T(v)` / `SumType(v)` (#22664)
- Fix missing bool AttributeKind.kind (#23159)
- Fix comptime `T.methods`  with generic types and interface checking with `is` operator (fix #22721) (#22724)

#### Examples
- Fix some of the instructions in `examples/thread_safety/` (#22571)
- builder,pref: fix `./v -os linux examples/json.v` on macos (#22651)
- Add examples/assets/v.svg and examples/assets/v_16x16.svg
- v.comptime: fix compilation of `examples/veb/veb_example.v` with V compiled with tcc on macos
- ci: ensure that all examples can still be compiled, by `v` compiled with tcc on macos
- Add poll_coindesk_bitcoin_vs_usd_rate.v
- Simplify and reorder output of poll_coindesk_bitcoin_vs_usd_rate.v
- builtin: fix `v -skip-unused -cc tcc examples/hello_world.v` on *BSD
- net.mbedtls: bump mbedtls_ssl_conf_read_timeout value to 550ms (tested with `v run examples/net_t.v`)
- Add a cpu_features/ folder, with several examples, using SSE and MMX assembly instructions (#22645)
- v.builder: fix `./v -check -stats examples/hello_world.v`
- docs: add a small sumtype match example in the Match section too
- Add TextScanner .skip_whitespace/0, .peek_u8/0, .peek_n_u8/0, add examples/mini_calculator_recursive_descent.v (#23001)
- Reduce completion friction, when doing the very common `v run examples/hello_world.v` in a shell


## V 0.4.8
*28 Sep 2024*

#### Improvements in the language
- A new `implements` keyword for explicit interface implementation
- Allow multi return as fn argument (#21991)
- Define a default sumtype value (based on the first variant type) (#22039)
- Remove the obsolete .code and .msg fields of IError (#22066)
- Fix generic lambda type binding and resolution (#22083)
- Comptime support for traversing the method parameters with `$for param in method.params {` (#22229)
- Show missing variants in the sum type error
- A much better and detailed unmatched fn arg error
- Add support for `@BUILD_DATE`, `@BUILD_TIME` and `@BUILD_TIMESTAMP`, all using v.util.get_build_time(), and overridable through SOURCE_DATE_EPOCH (#22213)

#### Breaking changes
- Deprecate `x.vweb` and `vweb` in favor of `veb`, a faster, easier, and more stable framework.

#### Checker improvements/fixes
- Disallow static fn call when receiver type is unknown  (#21970)
- Fix sumtype checking for voidptr variant (#21955)
- Check comptime veb.html('index.html') (#21961)
- Check if a parent generic struct has concrete types or not  (#21962)
- Add support for static methods in `@FN` and `@METHOD`  (#21990)
- Add a deprecation warning for `const ()` groups (an error after 2025-01-01) (#22019)
- Improve `-d trace_checker` and error diagnostic information on compiler panics
- Add error when initializing sumtype with struct as first type (#22067)
- Add infix checks for nil  (#22045)
- Fix map generic fn arg passing (#22071)
- Disallow using a preexisting const name in a for loop, as either a key or value ident (#22108)
- Fix generic lambda type binding resolution (fix #22109) (#22115)
- Fix array alias (#22175)
- Restrict multiple union fields initialised at once with a nicer checker error, instead of producing an enigmatic error at cgen time (#22196)
- Fix compilation of vlib/v/slow_tests/assembly/asm_test.amd64.v (regression after dfc0c91)
- Add missing check for ref passing to non-ref (#22194)
- Check struct implements non interface type (fix #22200) (#22218)
- Suggest using the `@[_allow_multiple_values]` attribute, when declaring enums that have duplicate values (#22224)
- Check for duplicate interface names in the `implements` parts of struct declarations (#22230)
- Fix missing struct field type checking for type mismatch (ref vs non-ref in `mt sync.Mutex = sync.new_mutex()`) (fix #18088) (#21949)
- Fix fntype var marked as auto heap (#22290)
- Check array.delete() argument mismatch (#22307)
- Add missing check for duplicated items on in expr (fix #22305) (#22308)
- Disallow infix expr on left side of assign  (#22322)
- Fix array fixed return type for interface methods (#22320)
- Check arguments mismatch of array.sorted_with_compare() (fix #22327) (#22328)
- Add an error for returning an `any` value in pure V code (prevents invalid cgen) (fix #12623) (#22334)
- Cleanup the checking of array method calls (#22338)
- Fix voidptr type checking  (#21923)

#### Parser improvements
- Fix lots of parser panics, discovered through fuzzing with radamsa
- Improve the error for keyword `lock`, used as a variable name (#21937)
- Improve the error message position for invalid array attr keys (#21944)
- Fix const field str() (#21998)
- Update `@include` in templates, to work with relative paths & prevent recursive calls (#21943)
- Check fn call args without comma between them (related #22021) (#22075)
- parser,scanner,ast: make the scanner and parser more robust, by implementing more limits (preventing panics, discovered by fuzzing)
- Protect against too deep recursion in Expr.pos() calls
- Check too many layers embedded generic type (fix #22089) (#22091)
- Cache ident lookups for consts in ast Expr str (#22101)
- Improve Type and TypeFlag related operations (#22107)
- Fix parsing map value inside or expr (fix #12164) (#22180)
- Fix const field str() (#22192)
- Fix `.${var}` used in a template, compiled by `$tmpl()` (fix #22231) (#22270)
- Check enum method duplicated (fix #20924) (#22294)

#### Compiler internals
- scanner: guard against scanner panic, discovered by fuzzing in PR#22016
- v.builder: show the thirdparty object compilation commands too, when using `-showcc` (when the cache is empty)
- builder: allow for `v -dump-defines - -check cmd/v`, which is faster, because it can skip code generation
- Reduce allocations for the most common cases (#22142)
- transformer: add support for instrumenting the V compiler with `-d trace_transformer`

#### Standard library
- encoding.base58: fix notice for slice creation (#21935)
- gg: reset ctx.mouse_d? and ctx.scroll_? at the end of each frame (fix #21945) (#21946)
- builtin: v_segmentation_fault_handler signal_number i32
- builtin: fix 'aaaa'.split('aa') (fix #21936) (#21951)
- builtin: panic on trying to grow arrays with capacity bigger than 2^31, instead of overflowing a.cap (partial fix for #21918) (#21947)
- gg: add a note that Context.new_streaming_image has to be called after Sokol's setup
- gg: add more documentation comments for gg.Config (the parameters of gg.start and gg.new_context)
- regex: fix regex.split() (fix #16876) (#21953)
- json: increase test cases before enabling sumtype decode in all json libraries (#21958)
- gg: change the type of gg.DrawImageConfig.rotate from `int` to `f32`
- gg: deprecate gg.DrawImageConfig.rotate, in favor of gg.DrawImageConfig.rotation, improve the documentation comments (#21963)
- x.crypto.chacha20: make Cipher struct public (fix #21967) (#21968)
- tmpl: fix an extra newline in @for; builtin: some i64 fixes
- gg: add an optional size: parameter to the .draw_pixels and .draw_pixel methods (defaults to 1.0)
- sokol: update to match upstream at c0e0563 (#21971)
- Add support for `Any` in `decode_struct`, `encode_struct` and `to_any` (#21972)
- crypto.cipher: make Stream.xor_key_stream implementers require a mutable receiver (#21974)
- sokol.audio: fix `./v -cc clang-18 -gc none simple_bytebeat.v` (the audio depends on threads)
- time: `d`,`c`,`dd`,`ddd`,`dddd` pattern support for parse_format() (#22003)
- flag: add optional value description to string parameters (#22024)
- flag: add custom value descriptions for bool, int, and float flags too (#22032)
- flag: fix assigning to `@[tail]` field when no fields has been matched yet in `flag.parse[T]()` (#22043)
- crypto: add a crypto.pbkdf2 module (#22047)
- hash: add more methods to the hash.Hash interface, to match the ones in Go (#22001)
- arrays: simplify arrays.sum and arrays.reduce (#22076)
- x.json2: support @[skip] as well (#22077)
- builtin,thirdparty: fix compilation of libgc with `-cc msvc -gc boehm` (thanks to @Ekopalypse)
- stbi: change Image.data from voidptr to &u8, to reduce casts (#21977)
- time: update parse_format comment description in parse.c.v (#22104)
- vlib: add an `arrays.parallel` module, containing `parallel.run/3` and `parallel.amap/3` implementations (#22090)
- builtin: support `-d builtin_print_use_fprintf`, make the C fn declarations stricter (#22137)
- builtin: fix map.clear() not resetting map's metas and keys blocks (fix #22139) (#22140)
- builtin: fix incomplete m.clear(), allowing the map to have a duplicated entry for its first key (fix #22143) (#22144)
- builtin: fix m.clear() having different observable behavior to `m = {}`, after multiple iterations of setting keys and clearing (fix #22145) (#22146)
- builtin: fix bug in .clear() caused by sizeof(u32) being 4, not 2 (fix #22148)
- flag: add support for parsing `flag.FlagParser` style flags in `to_struct[T]` (#22152)
- flag: fix parse_bool_value() (#22160)
- flag: correct bool logic, add test (#22162)
- flag: fix parsing `flag.FlagParser` style short flags in `to_struct[T]` (#22172)
- gg: change the type of PenConfig.thickness to f32
- builtin: remove remaining references to v_calloc in function comments (#22179)
- builtin: remove string interpolation from panic/1, to be able to use tools like cbmc in more cases (#22182)
- flag: add a relaxed parsing mode, that turn flag match errors into `no_match` entries instead (#22191)
- encoding.binary: add `u16`/`u32`/`u64` -> `[]u8` conversion functions  (#22193)
- crypto.sha1, crypto.sha256, crypto.sha3, crypto.sha512: improve performance for non prod builds, by tagging the block_generic functions with `@[direct_array_access]`
- builtin: fix string.trim() (fix #13021) (#22205)
- crypto.bcrypt: reduce runtime cost for running bcrypt_test.v, by reducing the iteration count
- crypto.scrypt: add a new `scrypt` module to vlib/crypto (#22216)
- sync.stdatomic: add OpenSUSE paths for libatomic
- crypto.scrypt: add missing comment of source for test vector (#22222)
- json: allow passing an anon struct as a decode type (#22228)
- flag: fix parse_bool_value() with different order short args (fix #22176) (#22242)
- builtin: drop C in int.v (#22245)
- strconv: fix format_fl()/format_es() (fix #13210) (#22244)
- json: fix decoding of structs with embeds (#22264)
- crypto.rand: add support for convenient generation of a random big integer in the interval `[0, n)` (#22266)
- json: fix json encode/decode with embed support (#22277)
- io: add a BufferedWriter and supporting methods (#22265)
- vlib: add a go like `x.benchmark` module, that estimates automatically how many iterations are needed, to get a statistically significant result (#22215)
- math: document q_rsqrt
- io: make buffered_writer_test.v more robust
- builtin: enable GC lib on rv64 build (#22319)
- json: support null sum types in decode()
- crypto: ecdsa module (on top of openssl)
- bench: crypto/ecdsa.v
- math.big: fix `a + b` and `a - b`, when the signs are different, add more test cases (#22330)

#### Web
- Check for using comptime $veb.html()/$vweb.html(), without importing veb or vweb (#21957)
- net: add net.Dialer and net.Connection interfaces, abstracting the different types of connections, already supported by the V network stack (#21657)
- net.mbedtls: support Server Name Indication (SNI) (#22012)
- veb: extract constants into consts.v (#22132)
- vweb: mark vweb as deprecated in its README, recommending using veb instead (#22131)
- veb: fix `vweb_livereload` reference to `veb_livereload` (#22171)
- veb: fix a few minor errors in the README.md (#22177)
- net.mbedtls: store the client ip (for ipv4), shutdown on handshake failure, in .accept() (#22184)
- veb: implicit context
- veb: make implicit context work with custom user types
- net.websocket: use retrying on EINTR in Client.listen() (#22279)
- net: allow ipv6 address with brackets (fix #22313) (#22316)

#### Database drivers
- db.sqlite: add instructions for installing SQLite's amalgamation or development package, if it is missing

#### C backend
- Fix struct ref field with no ref structinit (#21932)
- Define a flexible vint_t type (32 bit int on 32 bit systems, 64 bit otherwise)
- Fix generic sumtype with repeated concrete type (#21948)
- Fix array.map with closure var fn (#22002)
- Fix generation of closures from methods on aliases (#22004)
- Reduce indentation level for generated defer statements
- Fix selector with interface var (#22006)
- Fix free method generation for option struct (#22060)
- Fix fixed array with default init (#22059)
- Fix for loop with array fixed returned from fn (#22069)
- Fix free method for option fields (#22070)
- Fix auto free method for option map (fix #22081) (#22094)
- Return early from autofree related functions, when -autofree is not used
- Fix shared object method call (fix #22121) (#22125)
- Fix array fixed initialization from map indexing (fix #22133) (#22149)
- Fix generic options with reserved ident (#22164)
- Fix struct field with default optional value (fix #11119) (#22167)
- Fix array of fns index call with embeded array index (fix #17381) (#22198)
- Fix match with mut cond variable (#22207)
- Fix code generated for indexexpr with complex assigning (#22203)
- Fix interface type generation for generic struct (fix #22186) (#22189)
- Fix wrong type of vint_t and const riscv64 (#22251)
- Fix code for C ident when ptr is expected (#22259)
- Fix C name mangling with inherited closure vars (fix #22262) (#22263)
- Fix codegen for alias to charptr passed as ptr (fix #9679) (#22271)
- Fix codegen for option fntype used in a match (fix #22278) (#22280)
- Fix option cast from fntype (fix #22283, #22284) (#22285)
- Fix codegen for method call on rangeexpr (fix #12610) (#22291)
- Fix operation overload for type aliases of fixed arrays (fix #22297) (#22304)
- Fix codegen for assign from unsafeexpr resulting fixed array (fix #22301) (#22309)
- Fix variadic arg var passed to another call which expects variadic (fix #22315) (#22317)
- Fix aliases of array insert(...)/prepend(...) (fix #22323) (#22324)
- Fix codegen for interface method call which returns a fixed array (fix #22326) (#22331)
- Add `asm` to c_reserved, fixes compilation of `struct Abc { @asm int }` (#22340)
- Fix interface method call after smartcast (fix #17056) (#22335)
- Fix codegen for address of range (fix #18528) (#22336)

#### vfmt
- Allow align threshold to be parametrized in calls to add_new_info (#21942)
- Fix and simplify align of struct fields (#21995)
- Fix alignment of enumeration types (#21999)
- Fix enum fields with one empty line (#22007)
- Fix fmt of enum fields with empty line (#22015)
- Fix alignment of struct init fields (#22025)
- Keep empty newlines in between interface fields/methods (#22040)
- Fix interface fields or methods with empty newlines (#22046)
- Fix enum/struct_decl/struct_init fields with empty newlines (#22051)
- Fix interface fields/methods alignment (#22055)
- Remove the prefixed module name of const names, that are in the same module (related #22183) (#22185)
- Fix import selective with interface implements (fix formatting part of #22200) (#22209)
- Add a test for fn with c binding type args (#22212)
- Fix formating a file in an oscillating manner (fix #22223, fix #22026) (#22232)

#### Tools
- Implement a `-repeats/-R N` option to `v repeat`, to eliminate another need for platform dependent scripting
- ci: add hub_docker_ci.yml, for building docker images (triggered manually for now) (#22302)
- ci: use `docker compose` instead of `docker-compose` (see https://github.com/orgs/community/discussions/116610) (#21992)
- vrepl: suppress the welcome message, if VQUIET is set (#21941)
- Make `v where` ignore .git/ folders (they contain binary files); let `-dir .` work recursively, so that `-dir vlib` works
- Sort the match results in the vwhere test, to make it less flaky (#22033)
- Add an amalgamate tool and description of usage (#22034)
- Add a few missing v command entries and their flags in `v complete` (#22041)
- Colorise the output of cmd/tools/show_ancient_deprecations.v, reduce false positives (#22048)
- docs: clarify the .precision specification section for string interpolation of floats (#22061)
- docs: add a copy code function (top/right copy icon) on doc examples (#22114)
- Allow passing parameters to fuzz_v_parser_with_radamsa.sh, so that it could be run in several processes from the same folder
- Use separate .autofuzz.log files too for the separate invocations of fuzz_v_parser_with_radamsa.sh
- Extract .github/workflows/run_sanitizers.sh to ease local testing with different options
- parser,ast: protect against more overflows/panics, by forcing early returns on deeply nested expressions and scopes (#22098)
- Improve the output of `v repeat command`, by coloring the `faster/slower` label
- Add diagnostic in `v repeat` for invalid combinations of -r, -i and -a flags
- Fix `v doc` truncating code blocks, that lack a specific language (fix #22017)
- v.util: add get_build_time/0, supporting https://reproducible-builds.org/docs/source-date-epoch/
- Fix `v doc` not converting `<s>` in plain code blocks into encoded html entities in its .html output
- ci: run `npx prettier --write **.yml`; ensure it is run on all .yml files, not just the ones in the .github/workflows/ folder
- docs: add implements keyword for explicit interface implementations (#22214)
- Make fast_job.v more robust (setup a custom PATH) and informative on fast.v failures (compile it with -g)
- Make fast.v and fast_job.v more self sufficient
- ci: add cache and trigger for pushes, in the Hub docker action (#22314)

#### Operating System support
- docs: streamline the installation instructions and notes for Windows and Ubuntu
- v.builder: fix errors in cstrict mode on OpenBSD with clang (#22154)
- thirdparty: fix compilation of programs using miniz.h on macos
- crypto.rand: fix compilation on macos with `-cc tcc -no-retry-compilation -gc none`
- thirdparty: fix compilation of thirdparty/mbedtls with tcc on macos m1
- v.pkgconfig: fix parser, when `includedir=` lines, had trailing spaces (fix `-d use_openssl` for openssl 3.3.2 installed through brew on macos)
- builtin: fix compilation with tcc on OpenBSD using libgc (#22234)
- docs: add FreeBSD in cross compilation section (#22249)
- v.builder: enable LTO for clang on OpenBSD (#22247)
- thirdparty: fix compilation of programs using miniz.h on OpenBSD (#22254)
- net: fix compilation on windows (use casts to int for net.error_eintr etc)
- net: use explicit int casts for net.error_eintr etc in the unix implementation too for consistency with the windows one

#### Examples
- Remove drag_n_drop.v from the list of examples, that are checked for visual differences with vgret, since it now uses the default gg font
- docs: add more C interop notes and examples (#21965)
- cleanup obsolete unsafe{} usages in examples/sokol/sounds
- cleanup & fix the sound produced by melody.v
- add a simplified bytebeat player to show how to use sokol.audio, and that does not depend on gg
- make `rotating_textured_quad.v` compile and run on Android (#21987)
- veb: change example description, to avoid repetitive wording (ease debugging of issue#22017)
- eval: fix `./v interpret examples/hanoi.v`
- add examples/ttf_font/draw_static_text.v, to make it easier to test x.ttf with different fonts, and texts
- make draw_static_text.v show the font name too, for easier comparisons
- prevent cliping of long font names in draw_static_text.v
- docs: add an example on how to use Options/Results, when returning multiple values from a function (#22099)
- add examples/gg/draw_unicode_text_with_gg.v, for easy comparison of how different fonts and unicode texts will look, when rendered by gg
- add examples/veb/websocket, to show how to use http connection upgrade to a websocket, from a `veb` route (#22128)
- migrate vweb examples to veb
- fix type in veb_example.v
- add `gc_is_enabled()` check to `2048` to prevent crash in Android emulator (#22274)
- make `gg/rectangles.v` Android friendly (#22275)
- make `gg/stars.v` run on android (#22276)
- examples,os: add an os.asset module, use it to simplify code in examples/, by removing `$if android {` checks (#22281)
- add a consistent background to flappylearning, shown when the height of the view is very high (on Android)


## V 0.4.7
*26 Jul 2024*

#### Improvements in the language
- Add support for `-d ident=value` and retrieval in code via `$d('ident', <default value>)`
- `-warn-about-allocs` for debugging allocations when using manual memory management
- `@[freed]` attribute for assign statements (for the above mode)
- Implement `&&=` and `||=` operators  (#21678)
- Improve C var args interop, allow for `fn f(some int, ...) {` (#21812)
- A new flag `-n` for skipping notes (similar to `-w` for skipping warnings)
- Cross compilation to FreeBSD

#### Breaking changes
**none**

#### Checker improvements/fixes
- Fix unknown fixed array size for `const n = int(sizeof(u64)); _ = [n]int{}` (fix #21544) (#21548)
- Fix checking of default field initialisations, that are part of unions of structs tagged with `@[noinit]` (#21587)
- Disallow sum type with `Result` variants (#21620)
- Add error for `field map` (i.e. a plain untyped map), used inside a struct (#21625)
- Fix missing concrete type checking on a generic type specifier (#21614)
- Fix missing option and result wrong type return type definition (#21626)
- Turn warnings for private fields into errors (#21296)
- Support nested labeled for statements (#21658)
- Fix the return type of overloaded operators, defined on aliases of primitive types (fix #21654) (#21663)
- Fix match expr with auto promote number (#21696)
- Fix sorting compare fn with mut reference parameter (fix #21662) (#21706)
- Fix `$if x {` condition, using `const x = $d('ident', false)` (fix #21709) (#21713)
- Fix generic variable resolution on generic func return assignment (#21712)
- Fix result call or_block with multi-statements (fix #21504) (#21717)
- Allow `\uxxxxx` in raw strings (#21724)
- Limit recursion in Checker.ensure_type_exists/2 to 40 levels (it is usually 4 or less) (#21734)
- Add error for `field [$d('x', 2)]int = [1, 2]!` (#21741)
- Fix nested if expr method call (#21773)
- Fix generic inference in if expressions used in assignments (#21781)
- Disallow nil in non-nil arrays and vice versa  (#21786)
- Check expr evaluated but not used (fix #21436) (#21816)
- Fix wrong receiver generic resolution with embed types (#21833)
- Check mismatch of fn call mut argument (fix #21857) (#21873)
- Fix global fixed array key resolution when it is a constant ident (#21900)
- Improve checks for embed in anon struct  (#21877)
- Fix builtin fn var resolving (#21899)
- Fix spawn when calling undefined function (#21906)
- Require enum values to be declared, before using them in other enum values (#21913)
- Check enum field value duplicate (#21920)
- Allow embed of type alias anon struct  (#21928)

#### Parser improvements
- Register selective import aliases as used (#21613)
- Allow multiple flag values in enum.from() for flag enums (fix #21569) (#21615)
- Disallow duplicate operator overload  (#21675)
- Support `[$d('s', 4)]int{}`, move resolving to method on `ComptimeCall` (#21701)
- Support `$d()` in fixed size array `struct` fields (#21731)
- Suggest using type alias when defining methods on non-local types (#21803)
- Sugggest map initialization with the correct syntax  (#21817)
- Fix parameter collision for generated `@[flag]` enum methods, with modules named `flag` (#21844)
- Fix high order generic fn resolution (#21871)
- Fix recognition of `mod.Enum.val` inside fn args (#21908)

#### Compiler internals
- tools,cgen,pref: add `-coverage` support + `vcover`  tool (#21154)
- v.utils: allow to set the names of the compared items, when diffing strings (#21650)
- v.pref: fix regression of command flags not working, when there is a subfolder, named after the command, in the current working folder (#21647)
- transformer: handle `enum_variant = some_const + 10` (fix #21777) (#21779)
- v.builder: print the suggestion for using `v xyz` instead of `v xyz.v` just once (#21801)
- v.builder: improve the C compilation output on cgen errors (#21885)
- v.scanner: use table lookups for very frequently done character checks (#21931)
- markused: mark explicitly all used array and map methods with `-skip-unused` (fix #21907) (#21914)

#### Standard library
- builtin,v: reduce overhead and memory usage for very frequently called methods (#21540)
- builtin: reduce allocations in s.index_kmp/1 and s.replace/2 (#21561)
- os: remove mut declarions for unchanged vars in `os_nix.c.v` (#21564)
- os: make minior improvement to C function semantics and related code (#21565)
- builtin: simplify splint_nth methods (#21563)
- toml: fix `@[toml: ]`, support `@[skip]` (#21571)
- builtin:  update `last_index_u8`, deprecate `index_u8_last` string methods, make consistent with `last_index` (#21604)
- builtin: implement a JS version of `string.split_any` (#21612)
- crypto: add a `crypto.sha3` hash and extended output functions (#21664)
- crypto.sha3: remove unnecessary return at the end of the write function (#21669)
- builtin: fix string.find_between(), when not found end string return '' (#21670)
- builtin: add string.camel_to_snake/0 and string.snake_to_camel/0 methods (#21679)
- cgen,x.json2: fix generic map decoding (#21704)
- encoding.base32: fix warning of implicit clone of array, by using an explicit unsafe block (#21728)
- vlib: simplify byte character conditions by using methods like is_capital, is_lower, is_letter etc (#21725)
- gg: add Context.draw_cubic_bezier_recursive/2 and Context.draw_cubic_bezier_recursive_scalar/9 (#21749)
- ci: fix deprecations_consts.out (the warning for math.max_i8 is now an error; it was deprecated since 2023-12-31)
- math: add divide_truncated/2, divide_euclid/2, divide_floored/2 and modulo_truncated/2, modulo_euclid/2, modulo_floored/2 (#21759)
- math: avoid unused calculations for math.modulo_floored/2 and math.modulo_euclid/2
- crypto.blowfish: apply `@[direct_array_access]` to very commonly used functions (#21771)
- encoding.binary: little_endian_f32_at
- arrays: add arrays.chunk_while/2, where `arrays.chunk_while([0,9,2,2,3,2],fn(x int,y int)bool{return x<=y})==[[0,9],[2,2,3],[2]]`
- sokol: reduce _SGL_DEFAULT_MAX_VERTICES back to 1<<17 (1<<22 in 811ac12, leads to ~140MB of memory usage for gg/minimal.v, instead of just ~38MB)
- vrepl: fix os.input() (#21811)
- Improve consistency and behavior regarding explicit mutability (#21566)
- builtin: add `pub fn arguments() []string {`; make `os.args` use it, remove edge case in cgen (#21852)
- builtin: support `-d use_bundled_libgc` to make it easier to debug/upgrade reliably libgc cloned from ivmai/bdwgc (#21869)
- time: increase http_header_string performance (#21894)
- builtin: add s.trim_space_left/0 and s.trim_space_right/0 methods (#21903)
- strconv,math.bits: eliminate bounds checking in commonly used routines
- arrays: fix arrays.fold, when the `init` value in the call, is an array (#21921)
- string: fix leak in replace_once

#### Web
- net.http: change default http.Server listening address to :9009, to avoid conflicts with tools, that start their own http servers on 8080 like bytehound (#21570)
- net.urllib: update parse host to allow for better error handling (#21602)
- net.html: quick workaround for a cgen problem for `const x = int(0x80000000)`
- net.http:  implement http.download_file_with_progress/2, saving each chunk, as it is received, without growing the memory usage (#21633)
- veb: update import name in docs (#21668)
- Add `m3u8` MIME type `application/vnd.apple.mpegurl` for multimedia playlists (#21688)
- veb.auth: use constant time comparison in compare_password_with_hash (#21693)
- net.http: correct `Response.status()` method comment, to indicate returning of a `Status` enum field, instead of struct (#21735)
- net: fix TcpConn.peer_ip/0 to only return the ip address, without the port number (#21831)
- Add mime type `text/x-vlang`, for `.v` and `.vsh` file extensions (#21851)
- net.conv: add conv.reverse_bytes_u64/u32/u16 (#21917)

#### ORM
- orm: fix subquery without where expr (#21598)
- orm: ilike for case insensitive text search
- orm: update readme with more specifics (#21697)

#### Database drivers

#### Native backend

#### C backend
- Fix printing of floating point values in asserts (#21538)
- Fix array fixed initialization on struct from call (#21568)
- Put the `Interface(unsafe{nil})` change for now behind -experimental (#21593)
- Fix indexexpr with orexpr (fix #21591) (#21592)
- Fix generic struct init when it is a reference &T (fix #21594) (#21596)
- Fix generated code for handling fn call with result/option return on match conditional (#21608)
- Fix missing call to a function returning option, when called inside a print (fix #21616) (#21623)
- Support a `-d no_bool` option, for cgen compatibility with the C23 language standard (since `bool` is a builtin type and a keyword in it) (#21637)
- Fix or expr with non option fn call return (fix #21660) (#21661)
- Generate pragmas for gcc-14, to make it more relaxed by default. Support `-no-relaxed-gcc14` for turning them off. (#21680)
- Fix spawn code generated when calling conditional function (fix #19352) (#21681)
- Fix comptime generic arg resolution (allow several different struct fields in generic functions using comptime) (fix #18110) (#21682)
- Fix dumping array of reference (#21694)
- Implement g.trace_last_lines/2 to help debugging cgen problems
- Support inc cond for c style for loop with alias types  (#21708)
- Fix fn call with mut reference args (fix #21265) (#21719)
- Fix auto dereference mut variable in if expr (fix #21309) (#21720)
- Fix smartcasting a reference to a sumtype value (#21730)
- Fix assert checking fn option ret with `none` (#21726)
- Fix generics map with the reference argument (#21737)
- Fix shortcircuiting of infix and/or expressions (#21740)
- Simplify in infix_expr_and_or_op() (#21745)
- Fix reference variable str() method call (#21753)
- Fix scope command when `$dbg` breakpoint is on or-expr (fix #21772) (#21747)
- Fix array fixed empty struct code generated on clang (fix #21761) (#21764)
- Allow alias to array fixed to be initialized like `[n]int{}` (#21785)
- Fix comptime call argument auto conversion for indexexpr (fix #15232) (#21796)
- Fix const name without main prefix in `-translated` mode (#21789)
- Fix closure variable with optional reference params (fix #21827) (#21829)
- Fix auto str for fn struct member (#21825)
- Fix option string struct member init with autofree (#21859)
- Fix fn mut argument of sumtype reference (#21874)
- Fix generic type init syntax for primitive types  (#21872)
- Fix missing `&` in string representation of `map[X]&Y` (#21890)
- Fix optional closure direct call (#21892)
- Fix wrong missing unsafe block checking when calling generic functions with @[unsafe] attr (#21898)
- Fix typeof(var.typ) with comptime $for variables (#21901)
- Fix enum with const value (#21919)
- Fix generic option/result reference return (#21922)

#### vfmt
- Allow single line `defer {}`, just like `or {}`
- Don't break `it` variable name in match expression function calls (#21600)
- Exit with error code if encountering diffs with `-diff` flag (#21603)
- Add fn_with_mut_ref_params_keep.vv (#21711)
- Implement wrapping function's super long arguments  (fix #15545, fix #21643) (#21782)
- Keep manual newlines after fn parameters in fn declarations, do not auto wrap (#21795)

#### Tools
- Fix spurious ending quote in the output of show_manual_release_cmd.vsh
- Dockerfile.alpine: update to alpine:3.20, add more tools like gdb, libunwind, gc, to ease producing and debugging static executable in more situations (#21583)
- Add `v download URL` for downloading single files, to avoid curl/wget etc, which are not available uniformly. (#21597)
- ci: use shebang with better portability in shell scripts, format shell scripts (#21605)
- Don't write vpm logfiles in CI runs (#21649)
- ci: make vmodules_overrides_test.v failures more informative
- Fix measurements for `./v repeat "./vold -o x project/" "./vnew -o x project/"`
- Make the summary output of `v repeat` more informative
- Disallow self referencing function alias types like `type FnType = fn(string) FnType` and `type FnType = fn (FnType) string` (#21733)
- vrepl: fix method call (fix #21788) (#21792)
- ci: restore v_apps_and_modules_compile_ci.yml (#21791)
- vrepl: fix output of the fn call (related #21792) (#21800)
- vrepl: fix variable name starts with print (#21806)
- v.pref: make pref_test.v be less sensitive on the specific C compiler used as a backend (#21813)
- vrepl: fix arbitrary script execute (#21818)
- ci: disable c2v_ci.yml temporarily, until it is fixed
- vrepl: lots of fixes in REPL
- Add a TOTAL line, to the output of -show-timings, to minimise the need for external tools on windows (#21847)

#### Operating System support
- veb: support sendfile() syscall on FreeBSD (#21541)
- os: use 1 instead of C.SW_SHOWNORMAL to workaround a cross compilation issue from linux to windows
- v.builder: minimise the amount of linked libs for cross compilation to FreeBSD
- v.builder: support downloading the FreeBSD cross compilation files on first use
- Add a test for crosscompiling hw, on linux and macos, to FreeBSD (#21553)
- vlib: make `./v -Wimpure-v -W test vlib/` pass on Linux (#21554)
- os: fix debugger_present() for non Windows OSes (#21573)
- ci: extend coverage, move app test from macos_ci to v_apps_and_modules_ci (#21584)
- gc: fix tcc on macos
- os.font: return the "segoeui.ttf" font, if its file exists on Windows (#21655)
- readline: fix s := read_line('Message\nName:') on unix/linux (#21930)



## V 0.4.6
*20 May 2024*

#### Improvements in the language
- Experimental `x.vweb` is now `veb`, the official and recommended way to build web apps in V. Built on top of pico.v.
- autofree: -print_autofree_vars command line flag for printing variables autofree couldn't free
- Add `@VMODHASH` comptime variable to store the commit sha of a V module (#21091)
- Fix sumtype support for option variant types (#21101)
- Utilize new diff functions in errors (expected/found) (#21431)
- Add @[_linker_section] for global variables

#### Breaking changes
- checker: disallow initializing private struct fields outside structs module (#21183)

#### Checker improvements/fixes
- Ambiguous expression notice for `& << >>`, similar to `&& ||`
- Disallow using aliases of ?Type as !Type (#21128)
- Fix option checker arg validation for ptr passing on non expected ptr (#21087)
- Optimize option and result type check, add more typinfo to error details (#21105)
- Move error handling for `any` type to the checker to resolve parsing issues (#21146)
- Move error handling for user defined type duplicates to the checker to resolve parsing issues (#21147)
- Detect redundant ref when assigning call expr with ref return (#21141)
- Fix multi return using nil and voidptrfix (fix #17343) (#21144)
- Fix C struct embedded init fields checking (#21137)
- Remove resolved vfmt workaround and TODO (#21175)
- Move more match validation from the parser into the checker, add error for match without branches (#21181)
- Improve the error message for an unknown type (#21207)
- Allow passing `none` to `fn f(arg ?&Type) {` (fix #21213) (#21231)
- Fix -parallel-cc regression (part 1, workaround .filter(fn[c]) used in checker/orm.v) (#21238)
- Detect and error on unreachable code in loops, after `continue` and `break` statements (#21294)
- Disallow `Result` callbacks functions like `map/filter/all/any` (#21055)
- Fix missing check for or expr on string interpolation (#17566)
- Allow pass array as mut param to spawn fn (#21283)
- Turn array assign warning into error (#21341)
- Ignore last semicolon on or-expr (#21361)
- Disallow structs with `@[params]` attribute as mutable function parameters (#21206)
- Set auto Return pos correctly; cgen: autofree fix for optional returns
- Disallow invalid ptr operations  (#21515)
- Fix wrong checking for heap struct (#21511)
- Allow alias enum flagged to have bit operations  (#21532)
- Simplify, utilize pref.vroot (#21096)
- Fix option interface member checking when `none` is passed (#21509)

#### Parser improvements
- Fix option as possible match case for sumtype (#21079)
- orm: disallow invalid infix for where clause in `delete` and `update`  (#21113)
- Fix case of falsely registering imports as used, remove unused imports (#21156)
- Remove redundant comments_mode field (#21198)
- Update file path fields; use more expressive name for file path, remove obsolete `file_name_dir` field (#21202)
- Add missing docstrings for vlib/v/ast/comptime_const_values.v  functions (#21219)
- Allow struct init on `for in Iterator{} {` (fix #21179) (#21282)
- Fix `for x in Iterator{} {`, when there are no field initialisations (#21333)
- Add check for result type on chan init (#21363)
- Fix comptime panic for `$tmpl("x.html")`, when the template file contained % at the end (#21402)
- Parse string and array typ idx of `ScopeVar` and `Ident` (#21523)

#### Compiler internals
- v.util: use tmp instead of cache dir for temporary diff files (#21075)
- v.util: fix module lookup if module import parts end with the word `modules` (#21083)
- v.util: update `githash` to be able to get the githash of every passed project (#21178)
- v.util: improve detection for opendiff when automatically searching difftools (#21241)
- v.util: improve color_compare_files (#21247)
- v.util: improve find_diff_cmd: don't add spaces to result without env opts (#21242)
- v.util: fix diff coloring, add test (#21260)
- v.util: polish off diff utils after recent updates and fixes, add doc comments to pub fns (#21275)
- v.builder: suggest using `v wipe-cache`, when the object files are not recognized
- pref: be more conservative when generating code using `-cross`, allow for `$if cross ? {`
- builder: use cc enum in CcompilerOptions, fix cc detection, enable cc guessing without prod flag (#21370)
- pref: fix version flag handling (#21377)
- pref: make minor performance related changes / simplify (#21379)
- builder: simplify generic cc detection (#21380)
- pref: extract architecture related code into `arch.c.v`; rename `pref.c.v` to `pref.v` (#21387)
- pref: update `os_from_string`, add missing `qnx`, remove deprecated wasm options that used `-` instead of `_` (#21390)
- v.util: rewrite diff module, deprecate old functions (#21403)
- v.util: fix color when auto tool is `diff` (#21435)
- v.util: make diff_test.v more robust to the color settings for the chosen local diff tool
- v.util: fix performance with `v test-cleancode`, when a slower diff tool is installed (#21447)
- v.util: remove fast path in `diff.compare_text` (#21458)
- v.pref: error for `v file.v --unknown-option` (#21391)

#### Standard library
- builtin,dlmalloc: fixes for `v vlib/v/gen/c/coutput_test.v` for gcc14.1, which is stricter
- Min window width and height
- builtin: str.last_index(); pref: hide-auto-str;
- toml: update the alexcrichton and BurntSushi repos to their successors toml-rs, and toml-test, record new exceptions (#21152)
- breaking,vlib: update handling of imports whose symbols are not directly used in imported file, remove `pub const is_used = 1` workarounds (#21160)
- json: allow `i32` decoding and encoding (#21162)
- json2: add ability to decode arrays (#21163)
- json2,checker,toml: allow field.typ compile-time checking with MatchExpr and add array of option checking (#21171)
- gg: draw_text with custom fonts
- x.json2: add a way to decode an array (#21186)
- os: clarify some doc comments (#21209)
- os: fix double free in os.get_raw_line() (used by os.input), with `-autofree` (#21204)
- time: extract Duration related code into duration.v (#21229)
- builtin: implement an `at_exit(cb)` wrapper for C.atexit (part 1) (#21254)
- os: format readme, fix markdown inside html (#21286)
- time: update unix time acces, fix issues related to deviating unix times (#21293)
- vlib: refactor empty string checks to use `s == ''` or `s != ''`, instead of `s.len == 0` (#21300)
- cli: update `command_test.v` (#21307)
- cli: extend control over defaults (#21308)
- thirdparty/sokol: bump _SGL_DEFAULT_MAX_VERTICES and _SGL_DEFAULT_MAX_COMMANDS again; mark them with `__v_ start` and `__v_ end`
- sync: add Gentoo paths for libatomic
- sync.stdatomic: add flag lines for gcc 14 too
- gg: make `PenConfig` fields public (#21353)
- builtin: fix undefined read s[0], from ''.is_lower() and ''.is_upper() in c7af2c2
- builtin: fix empty string lower / upper assert (#21358)
- cli: simplify flag parsing (#21392)
- os,runtime: workaround for v.c generation instability
- datatypes: fix for set `-` operator, union and intersection, now they no longer change the receiver (fix #21315) (#21362)
- sync.stdatomic: add paths for compilation with musl on Gentoo (#21400)
- os: fix os.execute stderr redirection (fix #20986) (#21404)
- time: fix the string representation of a negative Duration (#21407)
- cli: make program outputs using the cli module testable in `cli/testdata` (#21456)
- math.unsigned: permit _ separators in Uint128 decimal strings passed to uint128_from_dec_str (#21461)
- cli: fix default flags when their command equivalents are disabled (#21469)
- toml: simplify `decode_quoted_escapes` (#21472)
- os: fix join-path (#21425)
- builtin: simplify MessageError.msg() (#21524)
- all: replace usages of C.atexit(cb) with `at_exit(cb) or {}` (part 2) (#21263)
- math.unsigned: fix some Uint256 bugs and add tests (#21528)


#### Web
- Update `mbedtls` to latest compatible version v3.3.0 (#21118)
- veb.auth: a minor find_token fix
- Improve descriptions (#21155)
- ci: change listen ports in vweb_should_listen_on_both_ipv4_and_ipv6_by_default_test.v for both vweb and x.vweb, to reduce probability of network errors
- ci: mark both vweb and x.vweb versions of vweb_should_listen_on_both_ipv4_and_ipv6_by_default_test.v as flaky
- breaking,net.ftp: allow to choose a different port than port 21 (change FTP.connect to accept `host:port`, not just a `host` address) (#21185)
- x.vweb: accept query params as method arguments (#21201)
- net.http.file: support index_file (`index.html` by default), and auto_index (true by default) parameters to file.serve()
- veb: copy x.vweb to veb, and make it work with comptime
- ci: fix the ubuntu-docker-musl job by skipping veb_app_test.v
- pref: support a shortcut: `v -http` for `v -e "import net.http.file; file.serve()"` .
- net: add a .port()! method for net.Addr (#21412)
- net: improve error message in .port()
- picoev: handle `EAGAIN` or `EWOULDBLOCK` quietly (#21480)
- net.unix: remove debug/trace eprintln (#21517)

#### ORM
- Add error for unchecked option multi return types, fix undefined behavior (#21106)

#### Database drivers
- db.mysql: fix invalid memory access in exec_one for returned rows with NULL fields (#21317)

#### C backend
- Enable autofree for option (#21051)
- Force C struct types which does not implement str() to be passed as ptr (#21054)
- Improve diagnostic information for ORM queries with invalid types
- Allow static call on generic type (#21071)
- Fix code generation for a struct field, having a type of fixed array of options `field [5]?Type` (#21082)
- Add the `_M_ARM64` macro to endianness check (#21109)
- Fix return code when returning interface result type (fix #21115) (#21130)
- Fix const initialized with array (#21131)
- Fix infix array heap comparison (#21145)
- Fix C struct sumtype support (#21129)
- Add `autofree` comptime check (#21197)
- Fix comptime `$if !autofree {` (#21218)
- Allow `for mut v in [12, 13, 14] { v+= 2 }`  (#21237)
- Allow op overload for type with generic parent  (#21262)
- Optimize .map(), .any(), .filter() and .all() when using closure (#21256)
- Fix `none` passed to a generic option cast expression (fix #21215) (#21276)
- Fix `-fsanitize=undefined` used with `[]int{}.sort()` (#21331)
- Fix `myarr [1]C.mytype` fixed array fields, for `pub type C.mytype = voidptr` (#21266)
- Fix comptime ref argument passing (#21335)
- Use the real C line number instead of `#line 1000000 ...` in the C footer with `-g` (#21388)
- Fine tune the line count reset for the C footer (fix off by 1 error in 00dd0bf)
- Fix array.delete_last call generation (#21439)
- Fix option ptr unwrapping (#21415)
- Fix C struct option alias printing (#21496)
- Handle auto deref var for index when the array element is an interface or a sumtype (#21491)
- Fix C struct init when it has default expr (#21510)
- Fix sumtype field naming (when they are the same as a C keyword) (#21527)

#### vfmt
- Update determining of struct field comments (#21066)
- Inform about invalid interop function bodies instead of removing them (#21070)
- Parse methods on JS interfaces, write JS method bodies (#21088)
- Improve module detection when formatting imports (#21134)
- Don't change paths when formatting imports (#21148)
- Use fixed size array for max_len const (#21140)
- Simplify const name formatting (#21143)
- Improve import processing, add test (#21172)
- Fix duplicates remove import comments (#21177)
- Extend import import alias reference map for submodules (#21200)

#### Tools
- doc: fix vup/vself replacement scripts (#21092)
- Prevent module updates during `v build-tools`, when VTEST_SANDBOXED_PACKAGING is set (#21094)
- ci: update the reference to the v-analyzer repo
- ci: retry all setup commands that need network access, till they succeed (so the CI jobs have less false positives) (#21103)
- changelog: escape `@NAME` entries, to avoid mentioning unrelated github accounts
- Add `v retry apt update`, intended to replace the retry.sh script, for more robust CI jobs (#21104)
- vpm: show the final path where a module is installed, improve color contrast for white on black terminal sessions
- vet: print help when passing no files or `--help`/`-help` flag after vet command (#21108)
- Fix `v build-tools` (it skipped all tools in subfolders of cmd/tools/ after 6a4f293) (#21120)
- .gitignore: ignore generated .NET files in bench/vectors (#21136)
- vet: optimize performance for path detection, when vetting files (#21139)
- vet: allow to overwrite excluded dirs (#21142)
- ci: increase wait time for the xvfb check, to reduce the chance of false positives
- Fix `v run cmd/tools/measure/parser_speed.v file.v`
- Add `v run cmd/tools/measure/fmt_speed.v file.v`
- ci: move build step for VPM site, into apps and modules ci, add concurrency config (#21191)
- tools.vpm: debug-log to `$VMODULES/cache/vpm.log` if not running in debug mode (#21192)
- vpm: optimize performance by adding filter when cloning (#21216)
- vdoc: don't add _docs directory when an out path is specified (#21233)
- ci: prefer dedicated tiggers for platform workflows, so sporadic fails can be retried quicker (#21251)
- v.util: improve code related to diff tool specified via environment, add check if the diff tool exists (#21240)
- vpm: check for git version before adding `--also-filter-submodules` flag (#21259)
- ci: add logging to .github/workflows/retry.sh
- Revise `vtest-self.v`: remove dead paths, fix json2 essential test path (#21267)
- Add check for unavailable files in vtest (#21272)
- ci: reactive app prod builds (#21295)
- ci: add a m1 runner for testing the prebuilt zips too
- ci: add workflow_run: event in prebuilt.yml
- ci: simplify prebuilt.yml, make it usable for manual runs too
- vpm: fix regression, so `v install sdl && v run ~/.vmodules/sdl/setup.vsh` works again
- ci: fix outdated_test.v (--unshallow is not needed now)
- ci: continue testing independent V apps, even if one fails, to get feedback for breaking changes faster (#21302)
- ci: optimize apps and modules (#21303)
- ci: test `v ~/.vmodules/sdl/setup.vsh`, to prevent future vpm regressions (#21306)
- ci: prevent unintended deployment workflow steps (#21313)
- Add a 2024.html page to https://fast.vlang.io/
- vdoc: rewrite and extend vdocignore (#21314)
- ci: fix the commit labels for the vc repo
- Support `v run cmd/tools/oldv.v --show_VC_commit weekly.2024.03`
- ci: use latest upstream `discord.v` in apps and modules test (#21322)
- vdoc: remove obsolete entries from `.vdocignore` (#21320)
- v: update linguist languages, add .vdocignore (#21321)
- ci: update deployment workflow (#21323)
- Allow for selectively running `v test-self vlib/` and `v test-self cmd/` (#21326)
- Rewrite test-self arg handling (#21327)
- ci: restore `v install elliotchance.vsql` in v_apps_and_modules_compile_ci.yml
- ci: use `v retry -- cmd` to replace `.github/workflows/retry.sh cmd`, where possible in `v_apps_and_modules_compile_ci.yml` (#21336)
- ci: update workflow conditions (#21338)
- Improve `v symlink -githubci` diagnostic message, when used outside CIs or with sudo (#21340)
- ci: update detection of workflow cancellation scenarios (#21342)
- Fix compiling vwhere with `-cc gcc -cstrict` (#21347)
- ci: remove the separate `-gc boehm` job (since `-gc boehm` is the default now) (#21352)
- ci: add a separate cmd/tools testing job (#21344)
- Update fast.v and fast_job.v to update docs.vlang.io and fast.vlang.io on each commit to master.
- Make fast.v more robust to independent remote changes in vlang/docs
- Utilize environment specific files for vsymlink  (#21360)
- ci: update `binary_artifact.yml` (#21364)
- ci: add docker to tools workflow, update ignore paths (#21368)
- ci: split up vsl / vtl run, reducing the tool change CI time from ~19min to ~10min (#21372)
- ci: fix binary_artifact.yml (#21373)
- Refine `check_os_api_parity.v` (#21371)
- ci: update native backend ci matrix (#21375)
- ci: update symlink ci, add matrix (#21376)
- ci: workaround defer codegen failing with nested if blocks and -cstrict in vdoc_file_test.v
- ci: update detection of accidentally added gpl licenses (#21384)
- ci: set cancel-in-progress to false in bootstrapping_ci.yml to avoid false positives
- ci: do trigger bootstrapping_ci.yml periodically, but just on changes
- ci: speed up bootstrapping_ci.yml, by using the default tcc when possible
- ci: update `bootstrapping_ci.yml` trigger paths (#21394)
- ci: pass a good commit to oldv.v in `bootstrapping_ci.yml` (#21393)
- Be more verbose when doing `v up` in V folder produced by extracting a .zip release file
- Exclude thirdparty/tcc from the git clean operation, that vup does in case of a missing .git folder
- Protect from cleaning during `v up`, only ./v , not any matching folder
- Use proper ignore/exclude patterns in the git clean, that `v up` does
- Use more meaningful names in vup.v
- Be verbose, when a git commands that `v up` executes fails
- ci: add a v-up-works-ubuntu job, to ensure more robust `v up` runs (#21401)
- ci: ensure v master is available when trying to check out its commits to build oldv (#21414)
- Rewrite vet error handling (improve parser performance extend vvet) p1 (#21417)
- Move dynamic const array check from parser into vet (#21423)
- v.help: update help for `fmt` (#21430)
- Move array_init_one_val checks from parser into vet (#21422)
- Remove `vet_errors` and `vet_notices` from parser (#21424)
- ci: temporary fix for gitly compilation
- Remove vetting for spaces after / before parens (#21437)
- Add `.github/workflows/show_manual_release_cmd.vsh`, to make cross platform testing of the release process easier
- ci: merge docker_alpine and docker_ubuntu workflows in `docker_ci.yml` (#21446)
- Move now obsolete vlib vet module to cmd vet (#21445)
- Use `parse_file`, remove `parse_vet_file` (#21444)
- ci: update binary artifact workflow, add matrix (#21378)
- ci: add workflow_dispatch: to gen_vc_ci.yml
- ci: fix vinix_ci.yml by using `./v symlink -githubci` in vinix_ci.yml
- ci: port changes from Vinix's check.yml at 8231e569 to vinix_ci.yml
- tools.vet: move error methods to `vvet/errors.v` (#21449)
- ci: reduce false negatives for tcp_test.v, retry it 3 times before failing
- Improve performance of `v test-cleancode` and `v fmt -inprocess -verify .` (#21450)
- Make `./v symlink` work platform independent in CI (part 1) (#21453)
- ci: replace .github/workflows/retry.sh usages in the CI with the shorter `v retry --`, move `v test-cleancode` upwards to save time for unformatted PRs (#21452)
- Capitalize information output of `v up` (#21464)
- ci: use `v symlink` without `-githubci` for regular symlinking (#21455)
- ci: add a linter for the .yml workflow files (#21459)
- ci: update symlink ci, extend tested cases (#21466)
- tools.vet: update diff comparison in `vet_test.v` (#21457)
- Call mkdir_all before set_output_path to avoid a vpm panic when ~/.vmodules/cache does not exist (#21463)
- ci: make issue template title consistent, fix linter error regarding labels (#21460)
- tools.vet: reduce nesting in `vet_fn_documentation`, skip vetting empty lines (#21465)
- Print info to use v symlink instead of `v symlink -githubci` (#21471)
- Move _test.v files for vdoc at the same level (#21473)
- ci: update the helper script, for getting the most recent sqlite-amalgamation-3380200.zip (#21474)
- vdoc: fix handling of .vdocignore files in subdirectories (#21514)
- ci: run build-module-docs, when changes to the source of the `v doc` tool happen too
- ci: use g++ not g++-11 in misc-tooling (g++-11 can not be found and installed on the CI runner anymore for some reason)
- ci: update g++ to g++-10 in other_ci.yml, add workflow_dispatch: trigger for easier local future diagnostic
- vdoc: improve vdocignore file handling by walking all .vdocignore sub-paths in IgnoreRules.get, add test (#21521)
- ci: run `v fmt -w cmd/tools/vdoc/vdoc_test.v`
- ci: make sure that unformatted code in just cmd/ is not allowed
- ci: mark again tcp_test.v as flaky (it had 3 unrelated failures on the CI over the last week)
- v: vet for empty string conditions (#21529)
- tools.vet: add notice for empty strings conditions (#21421)

#### Operating System support
- ci: improve test robustness on windows (#21116)
- v.pkgconfig: add pkgconfig path `/usr/libdata/pkgconfig` for FreeBSD base packages (#21151)
- v.util: add diff tool color support detection (tested on linux and freebsd) (#21244)
- v.util.diff: return diff options with the diff command for FreeBSD/OpenBSD (#21271)
- v.pkgconfig: fix load_paths with `;` split char on windows (#21291)
- Fix vpm on macos, when using the bundled git executable (#21292)
- ci: fix the bundled tcc for macos arm64 (#21299)
- ci: update the runner for build-macos-arm64 to `macos-14` too, so it runs on M1
- Fix hot code reloading on windows (#21351)
- Fix building vpm on the FreeBSD instance, that runs fast.v
- Fix `v install` for the FreeBSD instance that updates docs.vlang.io .
- ci: use macos-13 for cross_ci.yml to force the old non m1 runner
- v.builder: update macos->linux cross compile message (~22MB -> ~77MB)
- v.pref: fix new pref test on FreeBSD (#21385)
- ci: stop earlier on vc/v.c files, that may break on systems != linux (#21397)
- Fix compilation on macos-arm with `-cstrict`; run macos ci also on the arm runner (#21408)
- ci: use `v` instead of `./v` in the platform linux/macos/windows/_ci.yml files (#21454)
- ci: add a retry to vcreate_init_test.v (it is sporadically flaky on macos)
- sync,os,thirdparty: fix cross compilation from macos to windows (#21484)
- os: rename os_structs_stat_windows.v to os_structs_stat_windows.c.v to fix `v -Wimpure-v -os windows vlib/os/os_stat_test.v`
- Default to `-cc clang` on FreeBSD in `cmd/tools/vtest_test.v` (#21534)



## V 0.4.5
*20 March 2024*

#### Improvements in the language
- Add map update-init syntax: `new_map := {...old_map, 'k1': 1, 'k2': 5}` (#20561)
- Improve coroutines, Photon vcpu creation, coroutines + GC fixes (#20549)
- Update Boehm GC libs/headers to the latest version 8.3.0 (#20772)
- $dbg statement - native V debugger REPL (#20533)
- Implement `@[_linker_section]` attribute (#20629)
- Enable `@[export]` for global variables too (#20649)
- Add callstack support on v.debug (#20680)

#### Breaking changes
- sokol: the sokol wrapper was updated, to match its upstream version at commit 058a4c5, several of its APIs no longer exist
- templating.dtm: compile_template_file is no longer public
- v.trace_calls: `pub fn on_c_main() {`, is now `pub fn on_c_main(should_trace_c_main bool) {`
- v.transformer: Transformer.fn_decl is now Transformer.fn_decl_trace_calls
- x.vweb: Context.redirect(url string, redirect_type RedirectType) is now Context.redirect(url string, params RedirectParams)

#### Checker improvements/fixes
- Check invalid lambda expr (#20461)
- Fix comptime if with comptime smartcast (#20466)
- Fix anon struct init with const fields (fix #20452) (#20463)
- Disallow `option` or `result` return type, for infix operator overloading (#20494)
- Cleanup the const variable evaluate for fixed array fields of structs (#20503)
- Fix missing check for struct initialization with `@[noinit]` attribute, through using `T{}` (#20516)
- Fix mark methods into used-list, when generics as receivers (fix #20509) (#20527)
- Modify comments on generic receiver type storage (#20539)
- Fix checking give const map as default or init value to struct fields (fix #20512) (#20546)
- Fix return map index with or_block (#20544)
- Cleanup the generic tests (#20553)
- Fix `@[deprecated]` attribute for consts (fix #20523) (#20550)
- Cleanup in method_call() (#20554)
- Disallow `non_opt_array << optvalue` (#20573)
- Fix non dereferenced enum in match statements (fixes #10045) (#20591)
- Fix .variant smartcast on non-comptime variables (#20575)
- Disallow static maps: `mut static x := map[string]int{}` (#20596)
- Allow `#define X` and `asm riscv64 {}` blocks in .v files, with `-freestanding` (make embedded usecases easier)
- Add cast overflow checks (#20641)
- Disallow assigning none to _ (#20646)
- Fix checking for option matching with non-option (#20673)
- Disallow `(x) := 10` (#20695)
- Disallow `none` as match cond (#20688)
- Fix comptime ident checking on defer stmt (fix #20719) (#20723)
- Add error for `x as Y.field`, suggesting using `(x as Y).field` instead for clarity (#20725)
- Disallow sum type holding alias ptrs (#20786)
- Optimise out calls to `arg_typ_sym.embed_name()` when there are no errors (#20820)
- Fix if branch option type mismatch (fix #20809) (#20830)
- Fix auto deref arg when fn expects ref (#20846)
- Fix struct field init with generic fn variable (fix #20847) (#20878)
- Cleanup in assign_stmt() (#20880)
- Check assigning immutable reference struct field (fix #20814) (#20883)
- Fix struct field init with generic anon fn (add the test from #18294) (#20888)
- Fix checking match branch call expr twice (#20910)
- Support `Flags.bit ^ Flags.bit1` and `~Flags.bit` (flagged enums) (fix #20925) (#20929)
- Fix some specific interface generic inference within generics struct and method (#20932)
- Remove notice when shifting signed int for `@[translated]` (#20935)
- Silence "assigning 0 to a reference field" and "uninitialized fn struct fields" notices for `@[translated]\nmodule ...` files (#20938)
- Fix missing check for interface cast of option type (#20961)
- Silence more warnings for `@[translated]` files (#20964)
- Fix comptimeselector passing to generic argument (#20985)
- Remove unnecessary string interpolation in deprecation method calls (#21007)
- Disallow void return value lambdas in array.map method calls (#21011)
- Cleanup and simplify `check_ref_fields_initialized` methods (#21016)
- Cleanup and simplify struct processing p1 (#21009)
- Add support for deprecation messages for structs and struct fields (#21017)
- Cleanup and simplify struct processing p2, extend test (#21025)
- Fix undefined reference to interface struct field regression (after #21025) (#21030)
- Add test for interface embedding and interface with erroneous implementation (test related to #21030) (#21033)
- Disallow `Optional` and `Result` high val in a `for x in low..high {` loop  (#21043)
- Fix missing incompatible pushval type for chan <- operator (#21040)

#### Parser improvements
- Fix close_scope() missing, when field.name is `sort` or `sorted` (fix#20436) (#20485)
- Check non-generic interface defining generic method (#20545)
- vast,ast: output map init update expression (#20574)
- Implement `MyEnum.from(1)!` generic static method (#20411)
- Fix `MyEnum.from(0)!`, implement `MyFlaggedEnum.zero()` (#20623)
- vfmt,parser: keep the original import name in ast.Import, and use it without modifications for paths unders ~/.vmodules
- Allow double quotes in `@include` template directives (#20628)
- Fn type declaration does not check already registered name (#20732)
- Fix global const ordering with string inter literal (fix #20760) (#20770)
- Disallow option alias with option parent type  (#20769)
- Make Scope.find methods more robust, when called on default initialised `scope &Scope = unsafe { nil }` fields (#20774)
- Fix parsing of cgen.v, in normal mode, when the table is empty (no files in `builtin` are preparsed) (fix #20606) (#20611)
- Fix infinite loop in Parser.sql stmt in `-silent -print-watched-files` mode (used by `v watch`) (#20873)
- Disallow defining map key more than once  (#20905)
- Fix formatting comptime if expr, after inc expr (fix #20927) (#20931)
- Fix for comptime with fully type name (fix #20948) (#20988)
- Allow lock prefix instructions and numbered reg in inline asm blocks (#21022)
- Add better error for mut variadic fn argument  (#21063)

#### Compiler internals
- v.util: make launch_tool failures more detailed (for the `Text file busy; code: 26` case), bump tool_recompile_retry_max_count from 3 to 7
- v.util: make launch_tool more robust, when multiple `v -b js file.v` commands are run at the same time (all trying to recompile the JS backend program) (#20631)
- builder: allow for `./v -freestanding -cc riscv64-elf-gcc -d no_main -no-builtin -no-preludes -showcc -keepc x.v`
- pref: support file_notd_freestanding.v + file_d_freestanding.v, remove dependency to `os`, of $embed_file(), when compiling with -freestanding (#20712)
- v.builder: reduce the default noise from successfully rebuilding cached thirdparty object files
- pref: allow fetching the photonwrapper .so (for the coroutines) with curl too, or print details for manual download (#20855)
- scanner: disallow a shebang line, that is not at the top of a file (#21029)
- strings.textscanner: fix off-by-one error in skip method (#21045)

#### Standard library
- x.crypto.chacha20: speed up the core functionality of the ChaCha20 stream cipher (#20470)
- log: enhance log time format setting (#20484)
- encoding.csv: add a new utility fn `new_reader_from_file/2` (#20530)
- readline: add completion support (#20559)
- builtin: add `is_hex()`, `is_int()`, `is_bin()`, and `is_oct()` methods to the string type (#20540)
- builtin: add empty string verification for the new string .is_oct() etc methods, suggested on PR #20540 (#20564)
- json: fix struct with option enum field (fix #20597) #20597
- x.json2: fix panic on calling json2.decode of an optional enum (fix #20593) (#20603)
- vlib: add a compress.zstd module (#20616)
- io: ensure BufferedReader.read_line() returns `io.Eof`, instead of `error('none')` (#20619)
- log: add support for l.set_short_tag/1 (#20652)
- Update error checking for new error io.Eof (#20656)
- io: allow BufferedReader.read_line() to accept custom line delimiters (#20655)
- builtin: implement unbuffer_stdout/0 (#20662)
- x.crypto: add sm4 module (#20651)
- crypto.aes: optimise performance (#20674)
- os: add proper process termination with p.signal_term() (#20671)
- os: simplify and unify os.join_path and os.join_path_single, and add more tests (#21494)
- bitfield: enhance operation with multiple flags (#20683)
- os: fix File.read() in JS backends (fix #20501) (#20633)
- os: add error_posix() and error_win32() for explicit platform error handling and default behavior (#20694)
- log: implement set_always_flush/1 for log.Log, log.ThreadSafeLog and log.Logger (#20698)
- x.vweb: error() and simpler redirect(); comptime: a clearer error
- builtin: add a string.u8_array() method (#20736)
- os: add os.stat() and helpers (#20739)
- os: make os.SystemError struct public so the os.error_* functions can be used by other modules (#20754)
- os: refactor to use os.stat and os.lstat instead of unsafe C calls (#20759)
- os: make os_stat_test.v more robust to reporting false positives
- x.crypto: add poly1305 message authentication code (mac) in pure v (#20752)
- encoding.binary: add _fixed variants for the conversion fns, that accept fixed arrays (#20766)
- x.crypto.sm4: make sm4 use the encoding.binary _fixed fns (#20773)
- builtin: add gc_collect/0, gc_get_warn_proc/0, gc_set_warn_proc/1. Use them to turn off GC warnings by default. (#20788)
- builtin: support `-d gc_warn_on_stderr`, to show the GC warnings, without installing a custom warn fn callback
- x.crypto: add AEAD ChaCha20Poly1305 algorithm in pure v (#20817)
- x.crypto.chacha20: remove deprecated `math.max_u32` in favour of builtin `max_u32`, remove unneceseary bits, reorder (#20838)
- json: fix decode struct ptr (#20828)
- time: add a .http_header_string() method on Time (#20861)
- json2: reorganize encode string (#20862)
- vlib: add `encoding.txtar` (port of Go's txtar module) (#20874)
- gg: handle dpi change, when moving window to another monitor (#20886)
- time: add a tm_gmtoff field to `C.tm` (a BSD and GNU extension) (#20907)
- x.json2: add skippable field attr `@[json: '-']` (improve backwards compatibility with the `json` module) (#20892)
- time: rename identifiers and parameter names (#20913)
- io: add a `string_reader` submodule (#20893)
- toml: return an error from toml.parse_file(), when the passed file path does not exist (#20912)
- x.json2: fix encoder commas (#20916)
- time: microoptimise the Time formatting methods (use custom number->string conversion, instead of string interpolation) (#20917)
- x.json2: improve performance of string encoding for unicode special characters and emojis (#20867)
- x.json2: minor performance improvement, update benchmark recommendations (#20954)
- os: workaround a `-prod -cc gcc` bug, affecting os.open_file (fix #20923) (related to #20872) (#20960)
- cli: add pluralization to err msg, if required number of args is not met (#20971)
- os: remove repetitive words in comments (#20981)
- gg: fix empty circle in native; http: post_form_with_cookies; veb: print veb action in html errors
- io.reader: make read_all constants public (#20997)
- builtin: expose gc_disable(), gc_enable(), gc_is_enabled(), in addition to the existing gc_collect() (#21002)
- x.json2: improve error message upon missing comma (#20602)
- builtin: fix a few grammar errors in builtin.string comments (#21010)
- io.string_reader: fix needs_fill_until check (#21005)
- builtin: add missing return type to fn signature for C.GC_get_stack_base
- x.json2: predefine buffer capacity for encoding to avoid reallocations (#20920)
- rand: add PRNG.fill_buffer_from_set/2 (#21037)
- sokol.gfx: update the PixelFormat V enum, to exactly match the C sg_pixel_format from thirdparty/sokol/sokol_gfx.h

#### Web
- net: fix vlib/net/tcp_test.v (since .listen_tcp with af .unix, is now expected to return an error) (#20472)
- net: remove unused import in tcp_test.v
- x.vweb: add error, when static directory does not exist (#20455)
- net.urllib: fix parsing url error, when querypath is '//' (fix #20476) (#20504)
- vweb: unify listen address from tcp and print (#20448)
- net.unix: make the error messages in unix_test.v more specific (#20537)
- vweb: add an optional Context.before_accept_loop/0 method, to make testing easier and more robust (#20538)
- vweb: fix routes without results in vweb_app_test.v (#20548)
- vweb: make vweb_test.v more robust and faster, by embedding its server as a module
- Small fixes and backport changes from vweb (#20584)
- net.smtp: implement mail attachment support (fix #19920) (#20640)
- vweb: fix quickstart docs in the module's README.md on how to create a new vweb project (#20644)
- net.http: add a temporary fix for the intermittent segfault with http.get_ text/1 and `-prod -cc gcc` 13.2.0 (fix #20506) (#20660)
- x.vweb: support HTTP 1.1 persistent connections (#20658)
- x.vweb: use `$if debug_ev_callback ? {` for the `[vweb] error: write event on connection should be closed` message
- x.vweb: add cors middleware (#20713)
- x.vweb: add new sessions module (#20642)
- net: fix non-blocking read/write (#20438)
- net: reduce flakiness of tcp test (#20761)
- picoev: renaming, doc (#20567)
- x.vweb: add full static host support, for urls ending with /folder/ , where the folder backing it, has `index.html` inside (#20784)
- x.sessions: change session Store interface to use results instead of options (#20796)
- net: fix function name in split_address doc comment (#20794)
- doc: x.vweb static website capabilities (#20808)
- thirdparty: update picohttpparser (#20843)
- picohttpparser: restore formatting for g_digits_lut, after f09826e (#20844)
- x.vweb: fix handling of static URL paths like `/sub.folder/a_folder` (#20863)
- veb: a new module veb.auth for authentication logic (tokens, hashed passwords)
- veb.auth: make work with any db
- net: workaround a `-prod -cc gcc` bug (#20872)
- picoev: add more logging of errors (#20558)
- picoev: remove fmt off tags (#20569)

#### ORM
- orm: fix checking invalid recursive structs (fix #20285) (#20491)
- orm: fix checking invalid recursive structs in sql stmts (fix #20278) (#20505)
- orm: fix orm insert issue if table missing [Issue : #20017] (#20580)
- orm: fix orm_option_time_test.v after 2d0ed2c made insert in parent tables with child ones missing fail
- orm: insert expressions returning id

#### Database drivers
- db.sqlite: fix exec_param_many bug (#21008)

#### C backend
- Fix multidimensional fixed array size expression evaluation (fix #20311) (#20458)
- Fix fixed array handling with operator overloading call (fix #20467) (#20469)
- Fix C code, generated for generic option fixed array return type (fix #20465) (#20479)
- Fix fixed array handling, on generic result return, and on or block (#20492)
- Fix generated code for fixed array cast (fix #20454) (#20480)
- Change `x.filter(cond).len > 0` to `x.any(cond)`, and `x.filter(cond) == 0` to `x.all(!cond)` (#20513)
- Fix code generation wrong, when '?foo.array or {}' as a 'for-in' condition (fix #20528) (#20542)
- Add a necessary clone, when the closure param is string/array with -autofree (fix #20498) (#20557)
- Fix wrong cgen, when auto_heap var, is used as a closed over arg in a closure (fix #20208) (#20566)
- Initialize closures in shared library mode (#20630)
- Fix interface generic smartcast (#20609)
- Support inter-dependent function types (#20638)
- Write the profile file out, even upon CTRL-C or kill (#20677)
- Fix as cast as selector (fix #20710) (#20718)
- Fix method call checking against `none` (fix #20711) (#20717)
- Fix interface on multi return func (fix #20720) (#20721)
- Fix premature variable release by autofree (#20731)
- Fix return with option on orexpr (#20728)
- Fix auto str for map with ptr str (#20741)
- Remove `ull` suffix, which looks like the cause for the first scanner error in PR#20726 (#20750)
- Fix comptime smartcast as receiver on method call (#20749)
- Fix unwrap on or-expr, when calling f() ?Type (fix #20756) (#20758)
- Builtin,coroutines,cgen: fix using coroutines with boehm GC, by using a stack pointer corrector (#20771)
- Fix interface casting (#20789)
- Fix auto_eq for option eq operator overload (#20795)
- Fix from_string fn generation missing mod name (#20807)
- Fix const fixed array initialization handling (#20812)
- Fix unwrapped option selector assigning (#20816)
- Fix map methods call with generic types (fix #20827) (#20829)
- Fix codegen for a.index/1, where a is []Fn (#20849)
- Fix thread return type generation (fix #20836) (#20850)
- Fix code generated for anon struct default value (fix #20839) (#20851)
- Fix comptime selector of interface (#20876)
- Fix multiple fixed array variable init (fix #20895) (#20902)
- Ast,checker,cgen: fix generics function with embedded structs, ensure correct link generation in cgen (#20900)
- Fix returning option call in non-option fn (#20943)
- Fix global initializer of fixed array on gcc (#20934)
- Fix comptime `is` condition when using interface (#20952)
- Fix const fixed array init with index (#20950)
- Fix generic map inferring key and value types (#20959)
- Fix missing scope enclosing for const init which needs temp variables (#20973)
- Fix fixed array return on fn with option generic return (#20974)
- Fix code generated to comptime passed to generic arg (#20994)
- Fix match for alias  (#21028)
- Add ability to mark a global as `@[hidden]` (#21035)
- Fix _str name generated for C struct which define str() method (#21042)
- Fix for/in codegen when iterating over C structs (#21052)

#### JavaScript backend
- Fix javascript backend treating u32 as i32 (fix #20499) (#20618)
- Fix u16 cast handling in the JS backend (#20620)
- Make program_test.v not flaky anymore, so that it is more sensitive to early errors. Fix compilation error for u16.v . Make u32.out match the current reality (the bug will be filed separately)
- Fix inconsistent output (u32) in JS backend (#20691)

#### vfmt
- v.fmt: drop newline in end comments for const (#20672)
- Fix alias array no cast init (#20898)
- Fix removal of used selective and alias imports in modules in `$VMODULES` dirs (#20977)
- Improve submodule type alias lookup; fix formatting of modules in `$VMODULES` (#20989)
- Fix type names for casts (#21036)
- Insert auto imports after shebang (#21038)
- Fix autoimport with shebang and comments above other imports (#21050)
- Fix formatting for imports of submodule from module `src` dir (#21060)
- tools.fmt: extend exit codes to allow spotting unformatted files next to internal errors (#21058)
- Fix parsing of interface with comment above `mut:` keyword (#21062)

#### Tools
- repl: support executing shell commands on the REPL with `!sh [COMMAND]` (#20496)
- repl: fix an issue with `print` and println after the execution of `for` or `if` (fix #20524) (#20525)
- tools: bump too_long_line_length_table to 160, to avoid warnings for just `v check-md doc/docs.md` (most common)
- tools: bump too_long_line_length_link to 250, to avoid warnings for very common long links
- ci: simplify time_ci.yml, use more descriptive CI job names, for easier judging of CI failures
- debug: fix variable dereferencing (#20594)
- tools: support setting another SCANNER_MODE=parse_comments in parser_speed.v and scanner_speed.v
- testing: fix warning for compiling `./v cmd/tools/vtest.v`
- docs: add a section about modules specifics (#20653)
- github: add dependabot.yml (#20800)
- vtest,pref: add ability to have platform specific _test.v files (#20810)
- ci: change spaceface777/cancel-workflow-action to styfle/cancel-workflow-action (#20806)
- tools: use the same same skipping logic for the platform specific _test.v files in `v test-self` too (#20815)
- tools: make the output of `v check-md .` more informative (#20819)
- v.debug: implement tracing hook feature (#20818)
- ci: mark db_store_test.v as flaky
- ci: add a vtcc step (check that vtcc, continues to be able to compile with v, and v itself can be compiled with vtcc) (#21000)
- v.util: simplify vtest (#21013)
- vtest-self: add sandboxed packaging case (#21059)

#### Operating System support
- v.builder: allow for `v -shared -os windows file.v` on Linux/macos (fix #20445) (#20453)
- Add windows dll support, fix (#20447) (#20459)
- sync: add mutex.try*lock functions for FreeBSD too (#20482)
- sync: fix FreeBSD implementation of sync functions (#20483)
- os: make os.cache_dir() and os.vtmp_dir() more robust to parallel test executions on windows (#20495)
- builder: replace "-rdynamic" for clang on macos with "-Wl,-export_dynamic" (fix #20510) (#20511)
- builder: restore ability to use tcc, without fallback to cc on macos
- v.builder: use a more uniq prefix for the generated temporary file names, to further reduce the chances of collision and sporadic CI failures on windows (#20551)
- encoding.csv: fix bug in RandomAccessReader, spotted on windows with mingw32 (#20571)
- builtin: use `#pkgconfig bdw-gc-threaded` where available, instead of `#pkgconfig bdw-gc` (on FreeBSD)
- db.pg: add include and lib paths for PostgreSQL on FreeBSD (#20582)
- thirdparty: fix `v cmd/tools/vcompress.v` on FreeBSD
- os: fix an error in Process.win_spawn_process, not using stdout pipe in a cmd environment on 32bit Windows (#20613)
- testing: retry 1 additional time sporadic silent test run failures on macos
- builder: add '-lelf' to linker flags on freebsd (fix #20481) (#20643)
- GNUmakefile: use standard default RM make variable to fix MSYS2 env on windows (#20701)
- x.vweb: add the missing include for C.sendfile to sendfile_linux.c.v
- clipboard: fix notice in clipboard_windows.c.v (#20733)
- ci: update macos runners to macos-14, to make use of the much faster m1 instances (#20747)
- builder: support musl-gcc on macos
- builtin: link to user32 to fix boehm GC compilation on Windows with clang released from the LLVM project (fix #20724) (#20767)
- pref: download correct photonwrapper.so for linux (#20783)
- ci: improve repo CI robustness, by marking dynamic_template_manager_cache_system_test.v as flaky, and only failing db_store_test.v on !windows
- tools.vpm: fix remove command on Windows, add test (#20852)
- os: don't check rdev equality on FreeBSD, inside vlib/os/os_stat_test.v (#20885)
- sync: support more gcc version specific search locations on linux with tcc


## V 0.4.4
*9 January 2024*

#### Improvements in the language
- Implement `@[aligned]` and `@[aligned:8]` attributes for structs and unions (#19915)
- Update attributes to use new syntax
- Update remaining deprecated attr syntax (#19908)
- Support `$if T is $array_dynamic {` and `$if T is $array_fixed {` in addition to `$if T is $array {` (#19882)
- Prepare for making `-W impure-v` the default (#19940)
- Assigning `0` to reference fields now requires unsafe blocks (fix #14911) (#19955)
- Unwrap const() blocks
- Implement $for comptime T.variants (#20193)
- Add `r` and `R` switches for repeating in string interpolation, `'${"abc":3r}'` == 'abcabcabc' (#20197)
- Comptime refactor and cleanup (#20196)
- Allow comptime-for to iterate over comptime variables, add `$string` comptime type, cleanup (#20233)
- Unwrap an option value automatically, inside `if o != none {` (#20275)
- Complete support for smartcasting to a comptime variable type (#20270)
- Improve comptime var checking with `is` operator and smartcasting (#20315)

#### Breaking changes
*none*

#### Checker improvements/fixes
- Disallow `$for i in struct.values` and `$for i in enum.fields` (#19845)
- Parser, checker: fix var scope in lambda(fix #19860) (#19871)
- Change the warning `more than 1000 possibilities in match range`  to a notice (#19862)
- Fix inability to use multiple `import some modname as _` in the same .v file (fix #19899) (#19900)
- Disallow casting strings to pointers outside `unsafe` (#19977)
- Disallow directly indexing sumtype and interface, when using as parameters(fix #19811) (#19982)
- Fix loop on aggregates of arrays (in match branches) of sumtypes (fix #18548) (#19988)
- Disallow indexing mut struct, passed as a fn parameter (#19992)
- Enhance err msg for unknown types for comptime `$for` (#20057)
- Fix .clone()/.move() with shared maps (#20083)
- Fix generics method call with struct short syntax args(fix #20030) (#20100)
- Fix unwrap, when generic structs are used as arguments, in uncalled methods (fix #20132) (#20135)
- Fix generic fn with generic fn call returning generic map (fix #20106) (#20150)
- Cast sumtype to its variant generic type (#20166)
- Refactor `string` to `enum` error check, handle `EnumName(string_variable)` too (#20210)
- Fix generic array method call with multi-types (#20237)
- Remove unnecessary struct ref field initialization checks and notifications at map initializing(fix #20245) (#20251)
- Add a notice, for accessing by key, map values, that contain pointers (to use unsafe or an `or {}` block) (#20266)
- Fix mismatch checking when a function returns sumtype as an argument (fix #19325) (#20264)
- Fix and cleanup uninitialized checks for array initialisers with `len:` (fix #20272) (#20279)
- Give an error for `.free()` method calls, when used on fixed arrays  (#20320)
- Fix type mismatch checking for assignments with generics (fix #20298) (#20327)
- Fix too strict checking with generics in assignment type mismatch (fix #20335) (#20346)
- Disallow `string` to `voidptr` cast entirely (#20351)
- Fix generic method calls with multi generic types (fix #20330) (#20360)

#### Parser improvements
- parser: fix parsing comments after new attribute syntax
- parser: fix failures found with fuzzing (#19873)
- parser: deprecate old attribute syntax & update remaining (missed) attributes (#19879)
- parser: fix infix expr handling with cast on left side of << operator (#19985)
- ast: fix generic structs with multiple levels of generic embedding (#20042)
- parser: implement thread returns result and multi_returns (fix #19281) (#20194)
- parser: fix formatting struct decl with comments (#20207)
- parser: fix formatting enum and interface decl with comments (#20216)
- parser: fix fn call with newline opening brace (fix #20258) (#20267)
- parser: fix parse_vet_file() with vfmt off/on flag (#20273)

#### Compiler internals
- scanner: implement support for UTF-32 escape codes in string literals (#19911)
- scanner: add new_silent_scanner/0, Scanner.prepare_for_new_text/1, make .ident_char/0, .ident_string/0 and .text_scan/0 public (#20045)
- pref: support VNORUN=1, to enable running of tests, vsh files etc (i.e. just compile them, for debugging later)
- scanner: fix backslashes followed directly by newline in string literals (fix #20291) (#20296)
- scanner: fix escape character handling in character/rune literals (fix #20301) (#20304)
- pref: disable the -macosx_version_min clang flag by default (#20297)
- builder: remove passing `-fno-strict-aliasing`, for `-prod` to gcc/icc (#20368)
- markused: add `-skip-unused` for programs that `import x.vweb` too (do not skip unused routing methods)

#### Standard library
- json: fix recursive pointer encoding (#19840)
- os,picohttpparser,sokol,strconv: prepare for making `-W impure-v` the default (#19846)
- os: add fast path to mkdir_all, when the given folder already exists (#19869)
- os: ignore empty path segments in `join_path` (#19877)
- os: fix bootstrapping for OpenBSD
- x.json2: replace deprecated type byte with u8 in the tests (#19909)
- vlib: change byte to u8 (#19930)
- sync: add a FreeBSD specific version of vlib/sync/sync_default.c.v (#19962)
- datatypes: add push_many for doubly and singly linked list + add insert_many for heap (#19975)
- datatypes: make `Direction` pub and fix and add tests for `push_many` (#19983)
- gg: fn (data voidptr, e &Event) for events, allows methods
- vlib: add a `compress.szip` module, deprecate the `szip` one after 2023-12-31 (#20003)
- os: create the folder described by `XDG_CACHE_HOME`, *if it is non empty, and it does not exist yet*, when calling `os.cache_dir()` (#20046)
- vlib: use the builtin flush functions, instead of the C. ones (#20108)
- crypto: add blake2s and blake2b hashes (#20149)
- os: fix `mv_by_cp` for directories (#20154)
- os: update mv fns, improve performance, add params struct to control overwrite behavior (#20156)
- gg: fix overlapping slices in `draw_slice_filled()` (#20182)
- json: fix option sumtype handling (#20186)
- builtin: add `@[direct_array_access]` to js string trim_right method (#20222)
- json2: add encoder support for `time.Time`  (#20228)
- json2: fix encoding of 💀🐈 etc emojis (fix #20243) (#20247)
- json2: make public the generic function `map_from/1` (#20294)
- json2: optimise encoding to be faster than cJSON with -prod (#20052)
- json2: support sumtype encoding in a more robust way (#20093)
- json2: strict module (#17927)
- crypto: fix notices/errors for `v -N test vlib/crypto`
- crypto: add blake3 hash (#20319)
- sokol: fix compiling gg and other graphical examples on OpenBSD (#20333)
- csv: Add a sequential reader too (suitable for very large .csv files, it does not read everything at once) (#20140)

#### Web
- net.mbedtls: use `char` and `usize` types for describing more precisely the C API of mbedtls (#19837)
- vweb: add the mime type for .toml files (#19875)
- net.openssl: use actual C values for the SSLError enum (#19945)
- vweb: .html('custom_template.html')
- vweb: add an optional parameter to the .redirect/2 method, to be able to set the http code for the redirects (#20082)
- x.vweb: fix large payload (#20155)
- x.vweb: reimplement csrf module (#20160)
- net: make net.fionbio and net.msg_nosignal constants public in net_windows.c.v (#20183)
- net.http: remove unused `read_set_cookies` function (#20187)
- os, net.http.file: add a folder listing to the http static file server, started by file.serve/1 (#20192)
- websocket: enable using an already existing connection (from vweb or another http server) (#20103)
- x.vweb: fix fsanitize-address test for SSE, improve documentation on the usage of `takeover_conn` (#20249)
- net.http: support `-d no_vschannel` on windows, to fix long waits, while connecting on some systems (#20265)
- x.vweb: fix `$vweb.html()` integration in cgen for the newer `x.vweb` module (fix #20204)
- net: support only ip and ip6 in net.tcp_listener (#20336)
- x.vweb.assets: reimplement assets module for x.vweb (#20280)
- x.vweb.sse: reimplement SSE module for x.vweb (#20203)
- js.dom: add querySelector[All] and NodeList (#20240)

#### ORM
- orm: fix code generation for an option time.Time field (#20031)
- orm: fix the generated SQL for the "not equal" operator (#20321)

#### Database drivers
- db.mysql: add support for the FreeBSD name of the mariadb client library (#20039)
- db.pg: fix using postgresql on windows, improve instructions for installing it (#20053)
- db.mysql: add ability to prepare and execute statements separately (#20146)
- db.pg: fix compilation error with the msvc compiler on windows, and add readme (#20326)

#### Native backend

#### C backend
- Fix generic fn returning fixed array (#19885)
- Fix arrays alias built-in methods call(fix #19896) (#19910)
- Fix generic array initialization (fix #19903) (#19916)
- Fix option sumtype auto deref (#19919)
- Ast, checker, cgen: fix interface embedded methods call(fix #16496) (#19936)
- Fix ref and deref when an interface is used as a function parameter (fix #19947) (#19966)
- Fix auto str for interface struct member which implements str method (#19970)
- Fix generics call with interface arg (fix #19976) (#20002)
- Fix lambda initialization on option struct field (fix #19474) (#19995)
- Fix live mode on windows (#20041)
- Fix the static from_string method of Enum across mods(fix #20050) (#20068)
- Fix `@[if xyz?] fn init() {}`, add tests (#20096)
- Fix assignment to the elements of an array of fixed arrays (#20133)
- Fix mutable comptimeselector usage (fix #20027) (#20134)
- Fix generics chans select (#20159)
- Fix string interp with zero characters (fix #20199) (#20200)
- Fix interface eq method with option and ref (fix #19441) (#20201)
- Fix infix expr in method of mut receiver variable (#20225)
- Fix cgen for thread wrappers, when spawning fns with with anon-fn array args and mut interfaces (fix #19425) (#20241)
- Fix fixed array return when returning fixed array initialization (#20262)
- Fix function generated code, when returning from match (#20263)
- Fix in expression with mut and ref (fix #20268) (#20271)
- Fix initialization of const string arrays on msvc (fix #20287) (#20289)
- Fix code generation when 'in array init' is used as an if condition (fix #20300) (#20302)
- Escape table names (fix #20313) (#20322)
- Add missing clear method for generic maps (#20340)
- Fix auto unwrapping option fn type (#20332)
- Fix option initialization with default struct initialization to not be `none` (#20349)
- Fix auto str for arr options with possible circular reference (#20354)
- Fix code generation when the function returns mut fixed array (fix #20366) (#20367)

#### vfmt
- vfmt: automate transition from the old `[attribute]` to the new `@[attribute]` syntax (#19912)
- vfmt: remove empty `__global()` (#20004)

#### Tools
- tools: fix already installed detection when running v install --once without args (#19838)
- compress.gzip: change the endianness for validation to conform to the gzip file specification (fix #19839) (#19849)
- tools: support `v doc -run-examples math`, to ensure that all `// Example: code` doc comments are working (#19852)
- Fix `v help` in the prebuilt v executables from the zips in the releases
- ci,tools: remove skips for the wasm backend, since binaryen is not required anymore (#19883)
- tools.vpm: support again `http` installs, when installing from an url (workaround) (#19914)
- tools.vpm: improve version detection of installed modules (#19933)
- tools: fix `v up`, by not deleting `./v` when missing a `.git` folder (#19965)
- tools.vpm: fix installing of modules with conflicting names, extend tests (#19961)
- tools.vpm: evaluate dependencies earlier to fix potential recursive install loop (#19987)
- tools.vpm: add support for ssh and hg version installations (#20125)
- tools: simplify and remove redundancies in vshader.v (#20161)
- ci: add new workflow, for doing the slower tests in vpm specifically with `-d network` (#20177)
- tools.vpm: improve detection of already parsed modules (#20223)
- scanner: change `-d debugscanner` to `-d trace_scanner` for uniformity with the other tracing options, described in CONTRIBUTING.md
- v.pref: support a `-n` option, silencing only notices (#20331)
- ci: add vsql to v_apps_and_modules_compile_ci.yml too (#20341)
- ci: fix the workflow for Vinix, using the rules in its own .yml file (#20371)
- Support -? as alias to -help (implement #20355) (#20358)
- vdoc: filter testdata and tests folders by default, reduce filesystem stats calls

#### Operating System support
- os: small cleanup in the FreeBSD branch of os.executable/0: use fixed array for the sysctl params, instead of allocating a dynamic one (#20353)
- os: improve os.executable() on OpenBSD (#20356)
- v.util.diff: support OpenBSD's default `diff` tool (#20369)
- os: fix os.open_file/3 `wb` mode creation of text files containing crlf on Windows (#20101)
- os: fix File.tell for files > 2GB on windows, by using C._telli64(f.fd) (#20072)

#### Examples
- encoding.xml: make functions public, add documentation, tests, fix attribute parsing for self-closing tags  (#19901)
- examples: show how to turn on CORS in a vweb server app
- examples: serve the wasm mandelbrot project using a v web server (#19937)
- examples: increase the resolution of the generated image in examples/wasm/mandelbrot
- docs: update null convention in ORM example, since `@[nonull]` is no longer needed (#20286)
- docs: add an example of a nullable ORM field (#20292)
- example: add a path finding algorithm visualizer using gg (#20060)
- examples: add an even smaller gg usage example, demonstrating how to always show the builtin fps counter, and how to avoid importing gx





## V 0.4.3
*11 November 2023*

#### Improvements in the language
- A new `encoding.xml` module with parser, validation, entity encoding, unit tests (#19708)
- Better couroutines support (IO, networking)
- Allocations in vweb apps reduced by 80%
- Implement `@VCURRENTHASH` to replace `C.V_CURRENT_COMMIT_HASH` (#19514)
- int => i64 on 64 bit, i32 on 32 bit (start of the transition)
- Fix new int type promotion rules and cleanup native gen() (#19535)

#### Breaking changes
- `Request.cookies` map has been deprecated. Replaced with `Request.cookie()` and `Request.add_cookie()`.
- Stricter rules for C types (they always have to be declared now)

#### Checker improvements/fixes
- Turn the option/result split warning into an error
- Turn propagation warning into an error (finishes the option/result split)
- Fix fn call with option call argument in autofree mode (#19515)
- Bring back pascal case check for aliases
- C.xx = C.yy aliases
- Allow casted integral types in match ranges (#19572)
- Warn about byte deprecation, when used as a fn parameter (#19629)
- Allow size of fixed array to be integral casts (#19663)
- Fix generic array append (#19658)
- Check error of implementing other module private interface (fix #19620) (#19688)
- Extend byte deprecation warning to array init types (#19671)
- Extend byte deprecation warnings to return types (#19668)
- Fix negative cap, len checks in array init (#19694)
- Turn warning for var and param module name duplicates into error (#19645)
- Fix closure in if guard, including with multi_return (#19765)
- Fix comptime enumdata value property access (#19768)
- Fix `field ?&Type` without default value (#19786)
- Avoid nil assign to option var (#19746)
- Allow for a shared variable to be whole reassigned (keeping the same mutex state) (fix #15649) (#19751)

#### Parser improvements
- Fix assigning static method to anon fn (#19499)
- ast: fix formatting a struct declaration with a nested struct (#19592)
- Add `set_all` + `clear_all` methods to `[flag]` enum bitfields (#19717)
- ast: reduce cost of frequently called functions by using constants (#19733)
- Warn on unused imports, even when they are declared via `import math { sin, cos }`   (#19738)
- ast: add missing docstrings for the public fns in vlib/v/ast/types.v (#19752)
- Give a friendly error when misusing if over $if (#19810)
- Add multiple struct attributes error for new attribute syntax

#### Compiler internals
- checker, builder, pref: support `-dump-defines -` to help explore all the available user and system defines for a given program (#19576)
- pref,builder: add support for `-macosx-version-min 10.2` and `-macosx-version-min 0` (with default of 10.7) (#19626)
- pref: fix unintended file extensions in default output names, allow for `v run file.c.v` (#19745)
- transformer: fix using a constant, instead of a fn parameter with the same name (fix #19766) (#19773)
- maps: add maps.merge() and maps.merge_in_place() generic utility functions (#19776)
- coroutines: only attempt to add/remove roots when GC is on.
- markused: cleanup in mark_used(), use robust index names, instead of the much more brittle integer values (#19543)

#### Standard library
- builtin: add an `unsafe { a.reset() }` method, for quickly setting all bytes in an array to 0
- math.fractions: use operator overloading and deprecate old functions (#19547)
- gg: fix the alignment of the bottom border of draw_rounded_rect_empty on macos and linux
- crypto.bcrypt: fix bcrypt failure for valid pass and hash (fix #19558) (#19569)
- sokol: update sokol to the latest version
- builtin: fix sizeof(C.BOOL) (windows specific) (#19589)
- math.big: fix incorrect division with negative numbers (fix #19585) (#19587)
- os: add a convenient way to ignore certain system signals (#19632)
- os: fix os.ls(folder) on windows, when a protected folder can not be opened (#19647)
- os: add a convenient way to ignore certain system signals (#19639)
- crypto.sha: fix calculating the same hash values when .sum() is called several times for sha1/256/512 (fix #19696) (#19697)
- crypto.md5: fix calculating the same hash values, when .sum() is called several times (#19703)
- os: add a new function `execute_opt` (#19723)
- os: add os.page_size() (#19770)
- os: implement os.fd_is_pending/1, os.Process.pipe_read/1, os.Process.is_pending/1 (#19787)
- builtin: copy min/max integer values consts from `math` to builtin so that the entire math module doesn't have to be imported(#19809)
- json2: add support for nested structs (#19579)

#### Web
- vweb: add mime type support for static .md files
- net.conv: add varinttou64 and u64tovarint functions, for the variable unsigned integer encoding, described in rfc9000 (for QUIC) (#19568)
- net.http: support passing on_running, on_stopped, on_closed callback functions to http.Server{}, as well as show_startup_message: false. (#19591)
- net: fix handling of spurious wake-up signals, lost when calling select() in mbedtls and openssl (continue on C.EINTR) (#19600)
- net: use conv.hton* consistently, instead of `$if tinyc { conv.hton16(port) } $else { u16(C.htons(port)) }`
- net.http: support passing an HTTP proxy server in http.fetch (#19606)
- net.http: add a retry mechanism to http.fetch(), when the socket inevitably errors (#19660)
- wasm: implement inline assembly (#19686)
- net.http: increase max_redirects to 16 (#19743)
- picoev: implement raw mode (#19771)
- flag,json,net: handle C calls in .v files (part of enabling `-W impure-v` as default) (#19779)
- net.http: add socks5|http(s) proxy support [Linux] (#19676)

#### ORM
- orm: add null handling and option fields (#19379)
- orm: make is_null/is_not_null unary ops; don't bind null in where (#19635)

#### Database drivers
- pg: handle C calls, move to .c.v files (#19739)

#### Native backend
- native: support `-no-builtin` (generate executables < 1KB Linux with `v -no-builtin -b native examples/hello_world.v`)
- native: use i32 instead of int

#### C backend
- Fix printing fixed array of options (#19479)
- Fix struct field of fixed array init (fix #19483) (#19487)
- Fix struct init with multi option fn type (#19491)
- Ast, native, cgen: add support for `$if native {}` (#19500)
- Fix maps with i32 keys
- Fix for c stmt with option or result calls (#19641)
- Fix infix op when handling comptime selector (#19691)
- Fix array contains method with interface(fix #19670) (#19675)
- Reduce expense in repetitively called functions by using consts (#19732)
- Fix closure parameter judgment when var cross assign inside anon fn(fix #19734) (#19736)
- Only generate free in wrapper for spawn and not go (#19780)
- Fix g.obf_table data missing(fix #19695) (#19778)
- Fix closure variable in smartcast (#19796)

#### vfmt
- Remove additional line breaks after call_expr before params struct args (#19795)
- Fix map value alignment when using keys with uft8 symbols (#19689)
- Align ternary expressions in const blocks (#19721)
- Respect range index expressions in match branches (#19684)
- Respect raw strings in `$embed_file(r'/some/path')` expressions (#19753)
- Fix formatting of struct field with default value and new attr syntax (#19683)
- Recognize or blocks in call args (#19690)

#### Tools
- all: add support for `@LOCATION`, for more convenient logging/tracing, without needing to combine `@FILE`, `@LINE` at runtime (#19488)
- benchmark: add new methods b.record_measure/1 and b.all_recorded_measures/0 (#19561)
- ci: update c2v workflow, translate doom on macOS (#19562)
- strings: add Bulder.write_decimal/1 method (write a decimal number, without additional allocations) (#19625)
- testing: add temporary file hash to prevent accidental collisions with test file binaries (#19710)
- ci: compile VTL and VSL in their own CI job, with `VFLAGS=-no-parallel`
- tools: fix windows install of an already existing module with vpm (#19761)
- tools: use `VPM_NO_INCREMENT` env var to skip dl count increment when testing vpm (#19756)
- tools.vpm: improve handling of urls that end with .git (#19758)
- tools: fix resolving external dependencies in vpm, add test (#19772)
- tools: cleanup and simplify vcreate, for upcoming fixes and features (#19794)
- tools: improve error messages, add color coding and debug logging (#19781)
- tools: fix `v build-tools`, make `v test` more robust (#19803)
- tools: add parse_query to vpm (#19814)
- ci: add macos arm64 binary release (#19823)
- Require the presence of a `v.mod` file, to install external urls via vpm (#19825)
- vcreate: fix `v init` with project names containing dashes (#19619)

#### Operating System support

#### Examples
- tests: workaround name conflict, causing false positives with msvc on windows, when both tests were executed at the same time (locked executable)


## V 0.4.2
*30 September 2023*

#### Improvements in the language
- Short lambda expressions like `a.sorted(|x,y| x > y)` (#19390)
- Support `-os plan9`, `$if plan9 {`, and `_plan9.c.v` (stage 1 for plan9) (#19389)
- fmt: simplify the processing logic for removing inline comments (#19297)
- Align the custom values of the enum fields (#19331)
- Do not warn/error for `import flag as _`
- Keep anon struct decl fields in interfaces (#19461)
- Support -N, turning all notices into errors, to ease the process of finding places that may need attention/correction

#### Breaking changes
- Remove inline comments (#19263)

#### Checker improvements/fixes
- Disallow module name duplicates in local names (#18118)
- Check enum fields with duplicate value (fix #19309) (#19310)
- Disallow alias ptr cast of a map value (#19336)
- Require `else` branch in `[flag]` enum match (#19375)
- Disallow assigning pointer values to option struct fields (#19380)
- Fix generic comparison for conditional assignment (#19401)
- Allow using ! and ~ on aliased bool and integral types (#19403)
- Warn -> error for uninitialized ref fields
- Parser, checker: allow lambdas anywhere anonymous functions are expected (#19436)
- Allow for `each(a, |x| println(x))`, i.e. using lambda expressions, when expecting `fn (x int)`
- Check fixed array init with default expression (#19472)
- Allow for `const source = $embed_file(@FILE).to_string()`
- Fix C.type in imported modules

#### Parser improvements
- parser: fix fixed array with eval const size (#19269)
- parser: disallow using `sql` as name (#19298)
- parser: fix `;` support for `module x;`
- parser: fix fixed array of option values (`_ := [10]?int{}`) (#19392)
- parser: fix assigning with in another module sumtypes 2 (#19415)
- Support `;` statements, allowing for oneliners like `./v -e 'import os; println( os.ls(os.args[1])!.sorted(a > b) )' vlib/math` (#19345)
- v.ast: improve Stmt.str(), showing more details about ast.Block, ast.DeferStmt, ast.ForInStmt, ast.GlobalDecl

#### Compiler internals
- pref: support `-fast-math`, passing either -ffast-math or /fp:fast (for msvc) to the C backend, and `$if fast_math {` to detect it at comptime
- parser, transformer: fix transformer.infix_expr() and cleanup parse_types.v (related #19269) (#19276)
- pref,builder: support -use-os-system-to-run to workaround segfaults using not fully updated xcode command line tools
- v.builder: fix compiling code, that imports modules from both `src/modules` and `modules` (#19437)
- os, v.builder: show more details, when a program ran by `v run file.v`, exits by a signal (fix #19412) (#19471)

#### Standard library
- math: speedup the pure V math.pow implementation for non-fractional powers (#19270)
- math: add more C. fn overrides, for the default C backend (speed up examples/path_tracing.v) (#19271)
- time: add `MMM` support for parse_format() (#19284)
- os: include sys/sysctl.h on FreeBSD to avoid implicit definition of sysctl function (#19293)
- crypto.md5: change the Digest.write return type, from `?int` to `!int` (#19311)
- v.help: use os.executable() instead of `@VEXE` as an anchor, so `v help` will work more robustly.
- toml: fix custom `to_toml` for complex structs (#19338)
- vlib: add net.http.file, allowing for `v -e "import net.http.file; file.serve()"` (#19348)
- vlib: remove functions and fields, deprecated before 2023-03-20
- toml: fix toml encoding of complex types (#19408)
- arrays: add a partition function, that splits a given array, based on a criteria, passed as a callback fn (#19417)
- toml: add decoding for struct fields of type map[string]T (#19447)
- arrays: add arrays.each, arrays.each_indexed, and tests for them
- encoding.html: implement `unescape()` (#19267)

#### Web
- net.http: fix http.fetch(), without explicit method (default again to .get, not to .acl)
- net.http: default explicitly to Method.get for http.Request and http.FetchConfig too
- examples: add examples/fetch_ip.v, showing how to contact http://ifconfig.co/json and parse the result
- net.http: fix post error with https on windows (#19334)
- net.ssl: implement SSLConn.peer_addr() (#19333)

#### ORM
- orm: add `references` attribute to allow foreign key declarations on fields (#19349)
- orm: support different foreign key types, not just an integer id (#19337)
- orm: add support for V enum struct fields (#19374)
- orm: quote table and field name in `[references]` (#19387)

#### Database drivers
- db.pg: allow postgres connection using service definitions (#19288)

#### Native backend
- native: make native tests pass on windows; refactor PE file generation (#19140)
- native: parse dll files to resolve extern symbols (#19433)

#### C backend
- Fix printing struct with thread field (#19320)
- Fix the logic around the definition of VNORETURN and VUNREACHABLE (less warnings on FreeBSD) (#19316)
- Add support for `-d trace_cgen_stmt`, document it in CONTRIBUTING.md
- Fix printing smartcast interface variable (fix #18886) (#19372)
- Fix interface with multiple embedded fields (#19377)
- Fix channel of interface (fix #19382) (#19383)
- Fix fixed array of option type default (#19397)
- Fix interface with option field (#19434)
- Fix promoting an alias typed value, to a sumtype of the alias's base type (fix #19407) (#19423)
- Remove the special plan9 support code, treat it instead as a posix system in cheaders.v (#19445)
- Fix printing slice of fn call string (#19450)
- Fix `type VType = &C.CType` (#19452)
- Fix array of fns index call with direct_array_access mode (#19460)

#### Tools
- bench: a new bench/ directory for language benchmarks
- ci: test the pure V math versions without .c.v overrides on the CI too (#19292)
- github: add automatically info about voting to all new issues (#19351)
- tools: add -E flag to `v test-parser`, that will show the partial source that caused the parser to fail with `-no-builtin -check-syntax file.v`
- ci: bring back gitly
- github: improve the voting message for issues (#19448)
- vcreate: update templates, add `lib` (#19444)

#### Operating System support
- builtin: use `libgc-threaded` on FreeBSD, to get the threaded version of libgc (#19294)

#### Examples
- examples: add more .obj files for 06_obj_viewer (#19406)

## V 0.4.1
*3 September 2023*

#### Improvements in the language
- Pure `array.sorted()` and `array.sorted_with_compare()` methods, that do not modify their receivers (#19251)
- UB overflow has been removed
- Implement `Enum.from_string(name string)` for converting strings to enum values (#19156)
- Disallow casting string to enum, suggest using Enum.from_string() instead (#19260)
- Use autocasting in complex conditions (#18839)
- Allow alias as fixed array on return (#18817)
- Do not allow uninitialized function pointers
- Fix compiling V programs with latest clang 16 on windows (clang 16 is stricter than clang 14) (#19095)
- Fix anonymous struct with default expr (#19257)
- Allow using consts as enum values (#19193)
- `@[attr]` syntax to replace `[attr]` (`[]` is used for too many things). Most likely to be replaced with `@attr()` in the future.
- Allow `none` for not first values on map initialization (#18821)
- Make all .trace() methods generic on the type of the passed expression

#### Breaking changes
- `arr[1..4]` now requires `unsafe` if the slice can modify the original immutable array.

#### Checker improvements/fixes
- Disallow assigning `nil` to struct fields (#18725)
- Use autocasting in complex if conditions (#18753)
- Disallow invalid prefix on left side of assign stmt (#18750)
- Allow no return in compile_error else block (#18758)
- Fix interface param resolution (#18780)
- Add an error for `$tmpl` function type mismatches (#18826)
- Disallow voidptr cast to struct (#18845)
- Fix type checker on auto deref var (#18842)
- Check generic sumtype declaration (fix #18741) (#18865)
- Fix closure with inherited sumtype variable (#18894)
- "v -line-info" for a quick run to fetch info about objects on one line
- Make sure vweb actions return vweb.Result
- Do not allow modifying immutable vars via arrays with refs
- Support `@STRUCT` in static methods
- Fix generic struct field init recursively (related #19014) (#19025)
- Fix struct field fntype value call (#19067)
- Explicitly disallow creating type aliases of `none`, i.e. `type Abc = none` (#19078)
- Fix assigning an array slice (fix #19120) (#19137)
- Fix assigning array slice in struct init (#19150)
- Check enum static from_string arguments errors (#19163)
- Disallow taking the address of consts with int literal values (#19160)
- Check struct embed with wrong position (#19245)
- Optimize out needless string interpolations from the most common case in `Checker.expr_or_block_err`
- Check error for or_expr inside infix expression (#19213)
- Disallow `thread` as var name (#19174)
- Check error for sumtype in array (#19183)
- Disallow an empty `chan` type (#19167)

#### Parser improvements
- Change warn to error, for const names with upper letter (fix #18838) (#18840)
- Disallow declaring static functions as method receivers (#19007)
- Disallow having builtin type as type names for `enum`, `sum type` and `alias` (#19043)
- Support `const x := 123`, to make extracting locals as constants less annoying while prototyping
- Fix struct field fn type with default value (fix #19099) (#19106)
- Fix `for i++; i<10; i++ {` (fix #18445) (#19035)
- Fix fn return alias of fixed array (#19116)
- Fix generic struct init (Stack[&Person]{}) (fix #19119) (#19122)

#### Compiler internals
- pref: make -autofree work without -gc none
- builder,pref: allow thirdparty objects compilation with CPP compiler (#19124)
- scanner: fix string interpolation with nested string interpolation in inner quotes p. 3 (#19121)
- scanner: error early on an unsupported escape sequence in a string, like `\_` (fix #19131) (#19134)
- v.token: add inline next_to() and cleanup related calls (#19226)

#### Standard library
- eventbus: add generic support for event name (#18805)
- readline: add support for ctlr+w and ctrl+u shortcuts (#18921)
- strconv.atoi: fix string.int() returning numbers for non number characters (fix #18875) (#18925)
- builtin: reduce the number of array allocations for consts in all V programs (#18889)
- builtin: move array.data to the top of the struct
- os.notify: implement the kqueue backend for notify.FdNotifier (#19057)
- vlib: add a new module `builtin.wchar`, to ease dealing with C APIs that accept `wchar_t*` (#18794)
- arrays: add more util functions and tests for them - find_first, find_last, join_to_string (#18784)
- vlib: use sync.new_mutex() consistently for initialising all vlib structures containing mutex fields
- crypto.pem: add a static method `Block.new`, to replace `new` (#18846)
- crypto.pem: add decode_only and general improvements to decoding (#18908)
- log: improve the most common use case, it's no longer necessary to create a `Log` instance (#19242)
- crypto.sha512: make the new384/0, new512_256/0, new512_224/0 functions public
- json: fix option alias support (#18801)
- time: fix `parse_format` with `YY` (#18887)
- math.big: allow bitwise ops on negative signum (#18912)
- math.big: make is_odd public and add test cases (#18916)
- math.big: add checked division methods (#18924)
- math.big: add `isqrt_checked` and standardize error format (#18939)
- sokol: use GLCORE33 on linux
- os,term.termios: add termios.set_state/2, state.disable_echo/0, use them in os.input_password, to fix `v -os wasm32_emscripten examples/2048/`
- gg: implement Android specific APK asset loading for the `create_image` function (#19015)
- sync: make sync.Direction public (#19047)
- time: store time with nanosecond resolution in time.Time, deprecate Time.microsecond, add utility methods and tests (#19062)
- time: add a format_rfc3339_nano() method to time.Time
- time: add 'i', 'ii' in custom_format() for 12-hours clock(0-12-1-11) (#19083)
- gg: expand the `-d show_fps` background, so fps>100 will not overflow it
- Math.big: restore gdc_euclid, use it for smaller numbers, fix bench_euclid.v .
- Add new generic `arrays.uniq, arrays.uniq_only, arrays.uniq_only_repeated, arrays.uniq_all_repeated, arrays.distinct`
- builtin: add support for `-d builtin_writeln_should_write_at_once` and `-d builtin_write_buf_to_fd_should_use_c_write` (#19243)
- builtin: always show the assert message, if it was defined in the source, in non test programs too (fix #19240)
- time: check if a day is a valid day of its month (#19232)
- toml: Add generic automatic decoding and encoding of simple structs, when they don't implement custom methods (#17970)

#### Web
- http: Request.host
- net.ftp: fix dir() for file names, which contain spaces (fix #18800) (#18804)
- net.http: make listener public, and add addr in Server struct (#18871)
- net.http.chunked: return `!string` on decode (#18928)
- net.conv: rename functions to match other langs, making them easier t… (#18937)
- wasm: remove dependency on thirdparty/binaryen, webassembly backend rewrite (#18120)
- wasm: add a -wasm-stack-top flag to compiler (#19157)
- net.mbedtls: add SSLListener to allow creating SSL servers (#19022)
- picoev, picohttparser: reimplement in V (#18506)
- vweb: fix parsing of form fields, send with multipart/form-data (by JS fetch)
- vweb: make vweb route paths case sensitive (#18973)
- net.mbedtls: have shutdown close accepted connections too (#19164)
- http: add support for stream connections, and custom .on_redirect, .on_progress, .on_finish callbacks to http.fetch() (#19184)
- vweb: add a user_agent utility method to the vweb context (#19204)
- vweb: avoid the controllers having to be defined in specific order (#19182)

#### ORM
- orm: fix inserting sequential values (id=0), in tables with an i64 primary field (#18791)
- Add OR in where on update and delete (#19172)

#### Database drivers
- vlib: remove deprecated `pg`, `mysql`, `sqlite`, `mssql` modules. Leave only the `db.` prefixed `db.pg`, `db.mysql` etc
- db.mysql: add the exec family of methods (#19132)
- db.sqlite: add exec_param_many and exec_param methods (#19071)
- db.sqlite: make functions return results, breaking change (#19093)

#### Native backend
- native: move functions out of amd64.v (#18857)

#### C backend
- Fix selector code to use interface method table on closure when needed (#18736)
- Fix nested or expr call (fix #18803) (#18807)
- Ensure that `<<` and `>>` has higher precedence in the generated C code, than arithmetic operations (diff between C and V precedences) (#18814)
- Fix cross assign with aliased array (#18830)
- Fix generated code for returning generic result/option to comptime var (#18834)
- Fix option map with fn type value (#18849)
- Fix returning an option tuple - `fn f() ?(int,int) { return g() }` (#18851)
- Fix printing multiple fixed array (fix #18866) (#18879)
- Fix infix expr with number overflow (fix #18905) (#18936)
- Remove \r for consistency (#18962)
- Allow dump(unsafe{nil}) and dump(voidptr(123)) in the same program
- Implement fixed array of threads wait() (#19032)
- Fix an error with ptr interpolation (fix #19048) (#19049)
- Fix spawn call fn struct field(fix #18862) (#19096)
- Fix bootstrapping on older macOS Catalina
- Fix alias of array method call(fix #19125) (#19129)
- Simplifications and clean up.
- Fix mixed fixed array and array initializing (#19246)
- Fix array sort with fn call parameter (fix #19220) (#19221)
- Fix generic struct with option fn field (#19218)
- Fix comptime assign with generic result return type (#19192)
- Fix match with comptime if expr in branch (#19189)

#### Tools
- ci: add v-analyzer builds (#18835)
- ci: cleanup more the contents of the generated v_linux.zip, v_macos.zip, and v_windows.zip, use -skip-unused
- tools: fix vcomplete for zsh (#18950)
- tools: support a toc for projects, with single exposing module, in `v doc` (#19001)
- Add support for `v should-compile-all -c examples/`, which will delete all the produced executables at the end
- vgret: add install commands for ubuntu and arch to doc string (#19247)
- fast.v: add favicon to the html produced by fast.v
- vpm: implement multithreading (#19208)
- Make performance_compare.v more robust and easier to use, by allowing `v run cmd/tools/performance_compare.v` too
- Improve oldv windows support, make it use -municode for windows builds, make it support cmd.exe
- Make repeated runs of `oldv SAME_COMMIT -c "./v file.v"`, not use the network at all
- Help: add link to the TESTS.md at the bottom of `v help test`, run CI checks on help markdown files as well
- v.builder: show the number of files, types, modules, when a program is compiled with -stats
- Improve the output of parser_speed.v and scanner_speed.v


## V 0.4
*1 July 2023*

This release has a combined changelog from 0.3.1 to 0.3.5.

You can read it here:

https://github.com/vlang/v/blob/master/changelogs0.x/0.4.md

## V 0.3.5
*29 June 2023*

#### Improvements in the language
- **Coroutines with a scheduler**. Only Linux/macOS for now, requires `-use-coroutines` and
  `coroutines.sleep()` instead of `time.sleep()`. They work with IO and net, but not with GC
  for now.
- `spawn` now spawns system threads, `go` spawns coroutines.
- Static type methods: `Foo.new()` to replace factory functions like `new_foo()`.
- Smartcasting with complex conditions:`if sum_type is Foo && !sum_type.is_info && get_name(sum_type.info.name) == 'foo' `.
- Functions can now return fixed size arrays.
- Enum values now can have attributes.
- Generic functions as function parameters are now supported: `fn f[T](x T, i int, f_ Fn[T]) T { `.
- Anonymous structs can no longer have attributes.

#### Breaking changes
- `byte` deprecated in favor of `u8` (`byte` is automatically converted to `u8` by vfmt).

#### Checker improvements/fixes
- Disallow `Result` type aliases (`type Foo = !Bar`) and `Result` in maps (`map[key]!Type`).
- Add a missing check for taking address of literal value member.
- Fixed map initialization for maps with option values.
- Allow `a << none`, where `a` is `[]?&int`.
- Disallow multiple `else` branches in a match.
- Fix index expression with sumtype of array types.
- Remove hardcoded check for function calls for `C.stat`, `C.sigaction`, etc.
- Fix multiple embedded external module interface.
- Fix missing check for diff type on map value declaration.
- Simplify error handling in the checker (#18507).
- Option alias fixes.
- Fix alias to struct ptr on struct init.
- Sumtypes can no longer hold references.
- Fix a bug checking generic closures.
- A hard to reach limit of 1 million iterations for resolving all generics.
- Fix missing check for unwrapped shift operation.
- Fix enum max value validation.
- Add a missing mutability check for `array.delete` calls.
- Disallow `_ = <- quit`.
- Disallow type matching with primitive vars.
- Warning instead of error for unnecessary brackets in if/match.
- Include import aliases when checking for import duplicates.
- Fix inferring generic array type in nested call.
- Allow casted `enum val` and `const` as fixed array size.
- Disallow multiple return values in const declarations.
- Fix contains() with array of interfaces.
- Disallow mut for blank idents.

#### Standard library
- json: Enum value string serialization supports `[json:'alias']` to change its string values.
- Struct fields can now be skipped during JSON/ORM serialization via `[json:'-']` and `[sql:'-']`,
  in addition to `[skip]`. This allows having custom behavior for different serialization methods.
- builtin: heap usage API (gc_memory_use() and gc_heap_usage())
- math.big: refactoring, gcd fixes/improvements, overflow fixes, `mod_inverse`.
- flag: fix finalize with multiple shortargs.
- runtime: add new functions total_memory/0 and free_memory/0.
- time: small cleanup of parse_iso8601 comments, make the C.strftime declaration forwards compatible
- stbi: allow customization of number of channels in `stbi.load()`.
- stbi: add a `resize_uint8` function for resizing images in memory.
- time, x.json2: improve iso8601 time decoding.
- builtin: zero out internal map/array pointers on m.free(), to reduce the work for the GC
  mark phase for non escaping maps/arrays, used in hot loops.
- time: add more detailed error descriptions, add custom format parsing with time.parse_format.
- sync: add Mutex.destroy and RwMutex.destroy methods.
- datatypes: add Bloom filter.
- rand: add missing rand.u16(), update doc comments, add test.
- builtin: speed up string methods with vmemcpy instead of `for` loop for copying data.

#### Web
- The builtin websocket library is now thread safe.
- Enhanced builtin csrf protection in vweb.
- vweb: ability to set and get values on vweb.Context.
- vweb: support for host specific static files.
- vweb: host option added to controller, and a new host attribute.
- vweb: middleware docs improved; same with docs for `[vweb_global]` and `shared`.
- vweb: return 404 on file not found.
- net.http: copy IANA's list of methods to the http.Method enum.
- net.conv: use a pure V implementation instead of C.hton etc.
- net.html: `get_tag()` methods to find first tag occurrence.
- net.html: fixed text parsing for inline tags.
- net.html: fix parsing of nested quoted strings in code tags.
- picoev: FreeBSD support.

#### ORM
- Fixed a foreign key bug that could result in an extra insert.
- Comptime bug with `[skip]` and `[sql:'-']` fixed.
- Checker error for unsupported field types.
- Allow structs without the id field, more flexible primary keys.
- Improved docs and examples.
- Uninitialized structs are no longer inserted into related tables.

#### Database drivers
- mysql: TIMESTAMP support.
- mysql: allocate memory for each string and blob dynamically depending on its value length.
- mysql: add the ability to commit transactions.

#### Native backend
- Refactoring, splitting large files into multiple.

#### C backend
- Fix code generation for generic unions.
- Fix `[N]chan` (fixed arrays of channels).
- Fix nested fixed array instantiation.
- Fix fixed array of map.
- Fix stringification of usize struct fields (before, they were treated as 32 bit *signed* numbers).

#### Comptime
- A new `$res` comptime function to get returned value in defer block (#18382).
- Fix comptimeselector option propagation.
- A mutability check for comptime assignments.
- Fix comptime assigning to sumtype or indexexpr.
- Make comptime calls work with or-block.

#### Tools
- A new VPM site: vpm.vlang.io. A better design, discoverability of packages, descriptions, most downloaded packages etc.
- vpm: installation of mixed modules.
- `v ls --install -p D:\path\vls.exe` to install a local vls executable.
- vdoc: highlight comments with gray color.
- vet: allow vetting files with global variables.
- Make util.launch_tool/3 more robust, by recompiling V tools always in a known current working folder.



## V 0.3.4

*30 Apr 2023*

#### Breaking Changes

The following changes may break compilation of existing code or change behavior at runtime:

- `json`: enums are serialized as strings by default, `[json_as_number]` attribute can be used for
  the old behavior.

  If you are serializing enums to JSON in your application, then you will need to add the
  `[json_as_number]` attribute to keep the old behavior!

- Variable shadowing has been completely banned (previously variable names could conflict with
  module names).

#### Web

- vweb now supports live page reloading.
  The web app is instantly updated in the browser (no need to refresh the page)
  every time a **.v** or a **.html** file is changed.
- vweb is now significantly faster and more stable under load, due to a new multithreaded worker
  pool, which is much more efficient at spreading the workload among all threads equally.
- vweb now supports middleware.
- vweb now supports controllers.
  It's now possible to have multiple app structs to better separate logic.
- vweb now supports overridable `.not_found()` method for custom 404 pages in vweb.
- vweb now uses database pool.
- Fixed multipart form parsing in vweb.

#### Backends

- A new pure WASM backend, based on binaryen, a WASM `builtin` module, and a pure V WASM serialization library.
- Lots of fixes and new features in the native backend, including making codegen logic platform independent.
- Now code generated by the С backend, can be compiled by a C++20 compiler.
- C backend does not generate unused interface functions now.

#### Compiler CLI

- `v share file.v` for sharing code via the playground.
- `v up` speed up for when it hasn't been run for a long time (**vc/** bootstrapping has been
  optimized).
- `v init` no longer overwrites existing `src/main.v`.
- `v self` now uses a faster TCC backend on macOS (Intel/Apple Silicon), just like on Windows/Linux.
- A new command line flag `-e` for running short V programs on command line: `v -e "println(2+5)"` (
  works just like in Perl).
- A new `-ldflags` option, in addition to `-cflags`. Works just like LDFLAGS in C.

#### ORM

- All ORM queries now return `![]` (`Result` of an array).
  This allows handling/propagating DB errors and simplifies working with ORM (one way).
- Many ORM improvements: type checks for `limit/offset/order by/where`; support of reference objects
  in `insert`; struct fields can be used with `limit/offset`; `Connection` interface.
- ORM now supports the `like` operator:
  ```v
  users := sql db {
      select from User where name like 'Bob%'
  }
  ```
- A new `-d trace_orm` option to see all SQL queries generated and used by V ORM and
  `-d trace_pg_error` to trace PG errors.

#### Standard Library

- Added new `termios` module.
- `net.ssl`: types using ssl contexts can now be converted to strings via `.str()`/printed
  via `println()`.
- `v.reflection`: added type symbol info metadata.
- `crypto` and `math` modules have been updated to use `Result` instead of `Option`.
- `datatypes.LinkedList[map]` now works correctly.
- `urllib.Values.get()` now returns an Option.
- `strconv`: `v_printf()` was made private, `v_sprintf()` was deprecated. String interpolation
  should be used instead.
- `net.http`: mime types have been updated to include all official types.
- `gg`: `create_image()` now returns `!Image` instead of `Image`, allowing to handle errors.
- `sokol`: errors during image creation no longer result in a panic, but can be handled by the
  programmer.
- `sokol`: macOS apps can now be quit using **Cmd+Q**.
- `os.hostname()` and `os.loginname()` now return `Result`.
- `strconv.atoi` optimizations.
- `println()` now supports arrays with recursive references.
- `termux`: support for cross-compilation from termux to other platforms.
- `readline` module now works much better on macOS: key navigation, history, etc (now on par with
  Linux).
- `os`: fixed a memleak in `getline()`.
- `os.Process` now has a `create_no_window` option (Windows only).
- `os.Process` now has a `set_work_folder()` method to set the initial working folder of the new
  child process.

#### Option as a first class type

Final steps in making the Option type a first class type:

- If guards now work with struct fields which are `Option` functions.
  Such fields can now also be assigned to other fields/variables.
- Option receivers can no longer have methods.
- `none` can now be cast to all `Option` types, including aliases.
- Option references are now supported: `?&Type`.
- Arrays of `Option`s are now allowed.
- Allow `foo := Foo{}`, when `Foo` has an Option field, that is a struct, that has a `[required]`
  tag on its fields.

#### Compile-time Reflection

- Compile-time interface fields evaluation.
- Compile-time enum evaluation:
  ```v
  $for item in MyEnum.fields {
      println(item.value)
      println(item.name)
  }
  ```
- Added `$option` as a compile-time reflection type representing an any Option type.
- All special compile-time reflection types are now lowercase (`$int`, `$enum`, `$option`, etc).

#### Checker Improvements/Fixes

- Enums can no longer be initialized like structs.
- Capture variables can no longer shadow anonymous function params.
- Mixing multi-return results with other types in return statements is no longer allowed.
- Assigning anonymous structs to named structs is no longer allowed.
- `[required]` fields are now checked for embedded structs.
- Fixed a bug with closures with fixed array variables.
- Builtin methods `first/last/repeat` can now be used in custom user types (previously they only
  worked in builtin arrays).
- Generic struct initialization no longer needs explicit types to be provided:
  ```v
  struct Foo[T, U] {
  	a T
  	b U
  }

  foo := Foo{
  	a: 2
  	b: 'x'
  }

  println(foo)
  ```
- unsafe: dereferencing nil references is no longer allowed in the following case:
  ```v
  a := unsafe { nil }
  println(*a)
  ```

#### OSes

- Added basic QNX support.

#### Other changes

- Lots of documentation/readme improvements.
- Lots of playground improvements: [play.vlang.io](https://play.vlang.io), including a really cool
  feature: "Show generated C code".
- A new `[spawn_stack: 131072]` function attribute for controlling the max size of the stack of the
  spawned threads.
- Channel pop now works with an `or` block: `ch := <-self.item or { return none }`
- `it` has been renamed to `index` in array inits.
- "Is V still fast?" web-page has been sped up by splitting the result table into multiple years.

#### Development

- GitHub Copilot summaries in PRs.

## V 0.3.3
*30 Jan 2023*
#### Improvements in the language
- String interpolation simplified to just '${name}', enforced by vfmt, and updated in the entire code base.
- `go foo()` has been replaced with `spawn foo()` (launches an OS thread, `go` will be used for
  upcoming coroutines instead).
- vfmt now supports `// vfmt off` and `// vfmt on` for turning off the formatting locally for short snippets of code.
  Useful for keeping your carefully arranged matrices intact.
- Match branch range expressions with consts: `match x { const1...const2 {} }`
- Hot code reloading via `[live]` is now supported in imported modules, not just the main module.
- Syntax sugar for map inits without needing explicit casts for interfaces: `all.children := { "abc": rect, "def": ui.rectangle()}`.
- `$embed_file()` fixes, including variable args support.
- `none` fixes: no longer allowed to be used as a separate type, `dump()` support, not allowed inside `unsafe`.
- Const functions: `const y = term.yellow`, then `println(y('abc'))`.
- Builtin type names can no longer be used as identifiers.
- Generic `typeof[T]()`, `sizeof[T]()`, `isreftype[T]()` functions.
- Deprecated `-error-limit` in favour of the documented `-message-limit` option.
- Maps now support aliased keys.
- Operator overloading now works with reference types.
- Generic struct inits with nested generic structs and generic optional types are now allowed.
- During array creation, `len:` is required when using default values for the array.
- Optimized one byte `[]u8` arrays creation.
- Recursive aliasing is no longer allowed (e.g. `type Alias = map[string]Alias`).

#### Breaking changes
- `[]` is now used for generics instead of `<>`.
- Accessing a pointer map value requires an `or {}` block outside `unsafe`.

#### Checker improvements/fixes
- Lots of fixes in the type checker.
- Int signedness mismatch is now checked: `cannot use literal signed integer as u8`.

#### Standard library
- `math.vec` module for generic vector math including 2D, 3D, and 4D vector operations.
- Builtin stb_image.h used by gg has been updated to the latest v2.28.
- All of vlib has been updated to use separate Option/Result types.
- To avoid confusion, all references in the code and documentation to `Optional` have been replaced with `Option`.
- `gg.Context` pipeline has more effects, including the `additive` effect.
- Much cleaner eof checks in `os`: refactor `err == IError(os.Eof{})` to `err is os.Eof`.
- Lots of work on `x.json2`, the pure V json encoder, soon to become official.
- New `v.reflection` module for runtime reflection.
- Improved `os.mv()`, which now works consistently even across different windows drives/mount points.
- `string.trim_indent()`, useful with multi line strings, that start/end with new lines and indentation.
- Reduced memory consumption in the `crypto` modules.
- Official V UI library is now licensed under MIT.
- Deprecated `math.util` and `math.mathutil` have been removed.
- New time format support: `time.format_rfc3339()`.
- `encoding.html.escape()`.
- All public functions in the `hash` and `encoding.base32` modules have been documented.
- New `crypto.pem` module.
- New `map.reserve()` method.

#### Web
- Improved vweb stability under load.

#### ORM
- Various ORM fixes and improvements, including string interpolation support, type checks, fn calls in `where`.

#### Database drivers
- VFS support in the builtin `sqlite` module; `sqlite.get_affected_rows_count()`.
- Improved `pg` compatibility with older PostgreSQL versions before 2014.
- `sqlite`, `pg`, `mysql` have been moved to `db.sqlite`, `db.pg`, `db.mysql`.

#### Native backend
- Operator support for floats, multi return.

#### Comptime
- Improved compile time checks, like `$if x is Type {`; `$if T in [$Array, $Struct, $Alias, $Function] {`.
- `$for in` works with alias types.
- New comptime features for fields: `field.is_<field>`, `field.is_alias`, `field.is_enum`.

#### OS support
- Installation instructions for using V on NixOS.
- Better `make` support for OpenBSD.
- Much improved experience for `v install pcre` on Windows (it now bundles its own .c files, so it compiles cleanly, even if the platform does not have another pcre package installed).
- V can now be compiled with tcc on latest macOS and Apple Silicon.

#### Tools
- fast.vlang.io fixes & improvements, new server.
- New official IntelliJ plugin: https://intellij-v.github.io.
- Lots of new language documentation, a nicer table of contents.
- Improved documentation for most of the vlib modules
- `make.bat` & `v up` improvements on Windows.
- TeamCity test runner support via `v -test-runner teamcity foo_test.v`.
- CI optimizations for faster runs.
- New official AdventOfCode repo with AOC solutions, also added to CI.
- More detailed timings in `v -show-timings`.
- `v new <name> web` for quickly scaffolding new web projects.


## V 0.3.2
*31 Oct 2022*

#### Improvements in the language
- New simplified string interpolation: `println("Hello, {name}!")`. It will be the only way, old syntax (`${name}` and `$name`)
  will be deprecated.
- Easier custom error creation: `return MyCustomErr{}` instead of `return IError(MyCustomErr)`.
- All floats outputs now have `.0` conditionally appended to them to improve clarity.
- Custom integer enum types: `enum Xyz as u64 {`.
- AST transformer fixes and optimizations.
- Stylistic improvements and bug fixes in vfmt.
- Casting integers to enums now requires `unsafe{}`.
- Improved error and warning messages.
- Parallel compilation now uses `sync.Pool`.
- `-skip-unused` fixes, soon to be made the default.

#### Breaking changes
*No breaking changes*

#### Checker improvements/fixes
- Improved type checker: lots of new type checks and fixed checker bugs.
- Unused last expression in `if` is now checked.
- Anonymous structs visibility issues fixed.

#### Standard library
- `net.ssl` has been migrated from a dynamically linked OpenSSL to a statically linked Mbed TLS. This means that V binaries will no
  longer have an OpenSSL dependency. OpenSSL can still be enabled via `-d use_openssl`.
- msgpack module for decoding/encoding msgpack. (`v install msgpack`)
- Most of vlib has been updated to use the new Option/Result types.
- net, net.http, vweb bugs and fixes.
- QuadTree and RingBuffer types in `datatypes`.
- Forward iterator for `datatypes.LinkedList<T>`, forward and backward iterators for `datatypes.DoublyLinkedList<T>`.
- A new `maps` module, similar to existing `arrays`. It has generic `filter`, `flatten`, `invert`, `to_map`, `to_array`, `from_array`
  functions.
- `utf8.is_number()`, `utf8.is_space()` functions.
- New `encoding.base32` module.
- `gg.TouchPoint` to differentiate between different types of touch input.
- `str.int()` conversion speedup (without -prod).

#### Web
- `vweb.csrf` module.

#### ORM
- Support parenthesized expressions like `select from User where (name == 'Sam' && is_customer == true) || id == 1`.

#### Native backend
- Lots of native backend improvements, including library calls, comptime conditionals, enums, method definitions/calls, structs.

#### V interpreter
- Some further interpreter work.

#### C backend
- cgen cleanups.

#### OS support
- Removed the need for the `[console]` attribute in Windows GUI apps.
- More precise WINAPI declarations for easier integration on Windows.
- More CI tests on FreeBSD.

#### Tools
- New stunning playground with an improved look and feel, a much better and more responsive editor,
  code sharing by link, more convenient keyboard control, reusability for potential embedding:
  https://play.vlang.io.
- Improved call tracing via `-trace-calls`.
- Lots of documentation improvements, including a better documentation of the recent Option/Result split.
- V REPL: Home/End keys support. Lots of clean up.




## V 0.3.1
*31 Aug 2022*

#### Improvements in the language
- Anonymous structs.
- Lots of bug fixes: 90% of all bugs ever submitted are closed.
- New keyword/type: `nil`. Only to be used inside `unsafe`. Replaces `voidptr(0)`.
- V can now find code in the `src/` directory. This allows making V repos much cleaner.
- Support `assert condition, extra_message`, where the `extra_message` will be evaluated and shown if the assertion fails.
- Operator overloading now works with aliases and generics.
- Scanner optimizations.
- Using C's #define is no longer allowed in normal V code, only in `.c.v` files.

#### Breaking changes
- Anonymous sumtypes have been removed (deprecated for now) due to complicating the language and the compiler too much.

#### Checker improvements/fixes
- More type checks.
- Lots of fixes in `shared` types.

#### Standard library
- `os.mkdir()` now has an optional `mode` parameter.
- `encoding.csv` is now generic, supports bools, accepts a custom delimiter, and is compatible with io.Reader/io.Writer.
- `datatypes` module now uses operator overloading.
- All `datatypes` types can be converted to V arrays.
- `smtp` improvements including multiple recipients and base64/utf8 support.
- `arrays.carray_to_varray<T>()` for converting C arrays to V arrays.
- `strconv.v_sprintf()` has been deprecated in favor of string interpolation.
- TOML module now supports `[toml:...]` attributes, just like the JSON module.
- `os.walk()` is no longer recursive (still works the same).
- `io` has been migrated to `Result`.
- Third party window control in Sokol.
- `string.replace_char()`, `math.round_sig()`.
- Improved multiplication performance in `math.big`.

#### Web
- `net.urllib` ipv6 support.
- `net.Http.Response.text` renamed to `body`.
- `net.websocket` timeout is now configurable.

#### ORM
- ORM functions now return `Result`, so the errors can be handled.

#### Database drivers

#### Native backend
- Major improvements to the fast native backend including linking support on Linux. The goal is to be able to self host V soon.

#### V interpreter
- V interpreter improvements.

#### C backend
- Parallelized cc step. Speeds up -prod and clang/gcc compilation by 300-500% (depending on
  the number of cores). Experimental and hidden behind a -parallel-cc flag, soon to be the default.
- Intel C compiler support.
- Go backend fixes.
- `#preinclude` for low level C interop.

#### OS support
- Full termux support via `$if termux {`, more predictable logging on Android.
- Older macOS support (<10.12).
- Windows code has been removed from `v.c` distributed on non-Windows systems. (`v_windows.c` is used on Windows.)

#### Tools
- DOOM is now translated/compiled and launched on CI servers. A screenshot of the running game
  is made via `vgret` and is compared to the expected result.
- VLS performance improvements, especially on Windows.
- `v ls` tool for installing, for updating, and for launching VLS (V Language Server).
- `v doc` now has syntax highlighting.




## V 0.3
*30 Jun 2022*
- C to V translation via C2V: `v translate file.c`. (Demo video: [Translating DOOM from C to V, building it in under a second and running it!](https://www.youtube.com/watch?v=6oXrz3oRoEg))
- Lots of bug fixes in V, cgen, and C interop to allow running translated DOOM.v.
- Programs built with the V compiler no longer leak memory by default.
- Closures. All operating systems are supported. ([Demo](https://x.com/v_language/status/1528710491882852352))
- `Option` and `Result` are now separate types: `?Foo` and `!Foo` respectively. Old code will continue working for 1 year and will result in a warning/hint.
- Hundreds of new checks in the type checker.
- All V's backends have been split up into separate processes.  As the result, building V got 26% faster.
- Maps and arrays can now return options: `m[bad_key] or { ... }`, `if x := arr[key] { ... }`.
- `ustring` has been replaced with `[]rune` (works just like in Go).
- Maps can now have non-string keys.
- A new compiler pass for transforming the AST (doesn't slow the compiler too much, adds about 25ms to `v self`). It eliminates unreachable branches and performs other simple optimizations and transformations.
- C backend is now parallel (just the cgen part for now).
- Lots of compiler source code clean up and minor optimizations. The compiler got ~30% faster according to fast.vlang.io.
- Better compiler source code organization (absolutely necessary as it's surpassed 100k loc).
- The naming of V's integer types is now more consistent: `byte` has been renamed to `u8`.  Old code will continue working for 1 year and will result in a warning/hint.
- The typo detector now highlights the suggested name so that it's more visible.
- `datatypes` module now has `Heap, Queue, Stack, BSTree, LinkedList`.
- Interfaces can now be embedded (like structs).
- vlib now has a TOML parser, fully compatible with TOML 1.0.
- Lots of work done on the V.js backend, including the graphics library, which has been ported to V.js.
- JS promises, await (V.js).
- It's now possible to do more complex array initialization by using each individual element of the array (`[]int{init: it}`).
- Unsigned right shift operators `>>>` and `>>>=` have been added to V. (They work exactly like in Java.)
- `-nofloat` option, which is useful for writing kernels and for embedded systems without an FPU (used in Vinix).
- Generic interfaces.
- TCC is now bundled with the language, this allows building V programs without an external C compiler dependency.
- Null can be used in `unsafe` only (for example, for C interop).
- Pointer arithmetic and comparing pointers to numbers is now also only allowed in `unsafe`.
- Inline sumtypes.
- New module `compress.gzip`.
- Lots of `net`/`net.http`/`vweb` fixes (also used for the upcoming Gitly launch).
- IPv6 support.
- `net.http` headers are now enum fields instead of strings. This allows to avoid typos and offers autocomplete.
- Struct field deprecation.
- Static GC (no longer a dynamic lib dependency).
- New various algorithms for random number generation: MT19937RNG, etc  (module `rand`).
- Fix immutability bugs that allowed to bypass compiler immutability checks and modify const/immutable values.
- Lots of fixes in the JSON serializer.
- Heap allocated only structs marked with `[heap]`.
- Significantly improve lots of error messages, make them more clear, suggest hints.
- Bug fixes and new features in the pure V `regex` module.
- Lots of new drawing functions in the graphics module (like `gg.draw_polygon_filled(), gg.draw_arc_empty()` etc)
- Builtin FPS display in `gg`.
- Latest Sokol backend in `gg`.
- Advanced CI tests for the graphics module. Graphical apps are run on GitHub Actions instances, their output is saved to an image, uploaded, and compared to the expected result.
- More bug fixes in generics.
- Bug fixes in aliases. They can now fully replace the types they alias.
- `[minify]` struct attribute for struct minification.
- `for in` now works with fixed arrays.
- The parser was made a bit faster by skipping `vfmt` code when not in `vfmt` mode (by using `-d vfmt`).
- Lots of vfmt improvements, especially with comments.
- Experimental `#[index]` syntax for negative indexing (like in Python, but needs special syntax instead of being used by default).
- Visibility bug fixes in modules (`pub`).
- Error propagation in complex expressions (e.g. `foo(bar()?)`).
- Optionals can now by used in consts (`const x := opt() or {}`).
- Lots of new documentation, including vlib modules documentation and the official V Documentation.
- vpm improvements (including a new vpm mirror).
- `sync` improvements including `sync.thread_id()`, `sync.Once`..
- V can now be used to generate object files (`foo.o`) that can be used in existing C projects.
- `-usecache` and `-skip-unused` fixes, they are close to being on by default.
- Lots of Windows issues fixed.
- Amazon Linux support.
- Fixes in shared maps and arrays.
- `term.ui` improvements, including multi byte/UTF-8 events.
- New `crypto` modules, including `crypto.des, crypto.cipher, crypto.blowfish`.
- Comptime fixes.
- 4 byte bool option (`-d 4bytebool`) for compatibility with some C software.
- `strconv` (pure V formatting module used in string interpolation) fixes and performance improvements.
- ORM fixes (pg, mysql, sqlite). Tables are now created automatically based on the V structs, no more need in sql files to create tables for apps.
- `volatile` keyword.
- `"stringliteral".len` optimization (replaced by the actual number by the new `transform` pass).
- Lots of inline assembler improvements (it's used a lot in Vinix).
- Many new functions in the `math` module.
- Separators in number literals: `1_000_000`.
- `strings.Builder` optimizations and new methods.
- Autofree fixes (still not production ready, hidden behind the `-autofree` flag).
- Lots of Android fixes in V and in vab.
- Lots of commits to the native backend (amd64/arm64).
- V interpreter fixes. (Still at an early stage.)
- Go2V translator has been started by the community, and can already translate simple programs.
- An early version of the Go backend (`v -b go -o file.go file.v`).

## V 0.2.4
*30 Aug 2021*
- Introduce `isize` and `usize` types, deprecate `size_t` in favor of `usize`.
- Add `datatypes` and `datatypes.fsm` modules.
- Add `compile_error` and `compile_warn` comptime functions.
- Bare metal support. Vinix OS kernel is now being developed in V.
- Builtin web framework vweb is now multithreaded, all CPU cores are used.
- String interpolation and struct stringers are now implemented in pure V
with a much cleaner and faster implementation. Previously libc's `sprintf`
was used.
- Improved `unused variable` warning. Assigning to a variable no longer marks it as used.
*... lots of missing changelog for this version, sorry (will update a bit later)*

## V 0.2.2 - 0.2.3
*22 Jan 2021*
- Allow interfaces to define fields, not just methods.
- `vweb` now uses struct embedding: `app.vweb.text('hello') => app.text('hello')`.
- Consts can now be declared outside of `const()` blocks: `const x = 0`.
- Overloading of  `>`, `<`, `!=`, `==`, `<=` and `>=` operators.
- New struct updating syntax: `User{ ...u, name: 'new' }` to replace `{ u | name: 'new' }`.
- `byte.str()` has been fixed and works like all other numbers. `byte.ascii_str()` has been added.
- Smart cast in for loops: `for mut x is string {}`.
- `[noinit]` struct attribute to disallow direct struct initialization with `Foo{}`.
- Array decompose: `[1, 2, 3]...` is now `...[1, 2, 3]`
- Treating `enum` as `int` and operations on `enum` except `==` and `!=` are removed for strict type checking.
- Support `[manualfree] fn f1(){}` and `[manualfree] module m1`, for functions doing their own memory management.
- Allow usage of `<` and `>` operators for struct in `.sort` method for arrays, i.e. `arr.sort(a < b)`.
- Auto generate assignment operators like `+=`, `-=`, `*=`, `/=` and `%=` if the operators are defined.
- Colorize and improve failing tests output.
- Fix `go` with a generic function: `go test<string>(c, 'abcd')`.
- Add comptime `x := $embed_file('v.png') println(x.len) println(ptr_str(x.data()))`, for embedding files into binaries.
- Advanced vdoc search on mobile layout.
- string's `left()`/`right` were removed in favor of slicing syntax: `str[..pos]`.
- gg: native graphics mode on macOS/iOS (using Cocoa Drawing API).
- Full path to consts must be specified everywhere. This makes it easy to distinguish them
from local variables.
- `__offsetof` for low level needs (works like `offsetof` in C).
- vfmt now preserves empty lines, like gofmt.
- Support for compile time environment variables via `$env('ENV_VAR')`.
- Allow method declaration of `==` and `<` operators and auto generate `!=`, `>`, `<=` and `>=`.
- support `dump(expr)`, i.e. tracing of both the location, name and value of an expression
- deprecate os.exec in favour of os.executable() which does *NOT* return an option, when the command was not found

## V 0.2.1
*30 Dec 2020*
- Hashmap bootstrapping fixes.
- Array decomposition to varargs: `fn sum(i ...int) int` => `a := [2,3,4] println(sum(a...))`
- HTML module docs generated by vdoc now have global search.

## V 0.2
*22 Dec 2020*
- Compile-time memory management via `-autofree` (not production ready yet). [Video demonstration](https://www.youtube.com/watch?v=gmB8ea8uLsM).
- Channels and locks.
- Thread safe typed arrays via keyword `shared`.
- Struct embedding.
- IO streams (`io.Reader`, `io.Writer` etc).
- A powerful websocket module that conforms to RFC 6455 and passes the Autobahn test suite (498 client tests and 249 server tests).
- The `net` module is now non blocking and is more feature complete providing similar API to Go.
- V's graphics module now uses Metal/DirectX/OpenGL instead of just OpenGL.
- V can now run in the browser via WASM and execute V code by translating it to JavaScript:
https://v-wasm.now.sh
- V binaries for Linux/Windows/macOS are now built and deployed automatically via GitHub Actions.
- Smart casting for sumtypes and interfaces, including complex expressions: `if x.expr is int { println(x.expr + 1) }`.
- Clean and easy way to sort arrays: `users.sort(a.name > b.name)`.
- A huge amount of `vfmt` fixes and improvements. It has now reached a point where it can be safely used on any V source file.
- A new CI job that runs `v fmt -verify` on the entire code base, a new command that makes sure the file/directory
has been vfmt'ed. This ensures that all code submitted to the V project is formatted.
- A new tool `v vet` for analyzing the project and finding potential bugs and errors.
- A new `term.ui` module for building dynamic terminal UIs with an example editor written in it.
- Early iOS and Android support.
- All missing ORM features from the old backend were brought back.
- Magic `it` variable has been replaced with smart casts (the change is completely handled by vfmt).
- Cross-compiling to Windows and Linux brought back.
- C2V can now generate wrappers. Example: https://github.com/medvednikov/libsodium. (C2V will be released by 0.3)
- C++ compiler support: code, generated by the C backend can now by compiled by C++ compilers.
- Short generics syntax: `foo(5)` instead of `foo<int>(5)`.
- Cached modules via `-usecache`. Faster compilation due to not needing to rebuild the entire vlib for
each program. Will be enabled by default in 0.2.1.
- New improved sum types implementation.
- Lots of errors that happen often during the development cycle were turned into warnings to increase
  development speed. They are still errors in production builds.
- Labeled `break` and `continue`.
- Lots of documentation. The official language documentation grew 3 times in size.
- `modules.vlang.io` is now generated automatically on every commit.
- Builtin compile-time JSON serializer now supports `time.Time`.
- Fixes in type aliases, to make them behave just like the types they alias.
- `array.contains(element)` is now generic.
- Lots of improvements in the JS backend and its type system.
- Simpler and more constinent function arg syntax: `foo(a int, b int, c string)` instead of `foo(a, b int, c string)`
- Lots of fixes and optimizations in the hashmap.
- Lots of missing checks in the type checker were added (for example, checking the correct usage of public struct fields).
- Mutability bug fixes
- Taking the address of a map value is no longer allowed, like in Go.
- Matrix multiplication.
- A new `#pkgconfig` flag to provide platform independent way to get compilation flags for C libraries/packages.
- Explicit parentheses requirement in complex boolean expressions.
- `println` was made even smarter, and can now handle complex types.
- Precompiled text templates can now be used outside of vweb via `$tmpl()`.
- Gitly, a big web application written in vweb has been released: https://github.com/vlang/gitly
- `['/:arg1/:arg2/action']` vweb action attribute for easily getting query parameters assigned to method arguments.
- Improved performance of text rendering, `gg.text_width()`.
- Webview module in V UI.
- Binary enum flags.
- `[export]` attribute to change exported function name (for example for calling from a C library).
- `unsafe` fixes and improvements.
- Improvements to rand: `rand.ulid()`, `rand.uuid()`, a unified customizable PRNG API.
- Hundreds of other fixes, features, and tests (from now on the changelog will be updated
right away as the feature/bug fix lands).


## V 0.1.27
*5 May 2020*

- vfmt has been re-written from scratch using the new AST parser.
    It's much faster, cleaner, and can format
files with compilation errors.
- `strconv`, `sprintf`, and `printf` in native V, without any libc calls.
- Interfaces are now a lot more stable and have all expected features.
- Lots of x64 backend improvements: function calls, if expressions, for loops, local variables.
- `map()` and `filter()` methods can now be chained.
- New `[]int{cap:cap, len:len}` syntax for initializing array length and capacity.
- New `is` keyword for checking the type of sum types and interfaces.
- `as` can now be used to cast interfaces and sum types.
- Profiling with `-profile`. Prints a nice table with details about every single function call:
    number of calls, average time per call, total time per function
- `import(xxx)` syntax has been removed in favor of `import xxx` for simplicity and greppability.
- Lots of fixes and improvements in the type checker.
- `time.StopWatch`
- `dl` module for dynamic loading.
- Automatic `str()` method generation for every single type, including all arrays.
- Short struct initialization syntax for imitating named function args: `foo(bar:0, baz:1)`.
- New operator `!in`.
- Performance improvements in critical parts of the builtin data structures (array, map).
- High order functions improvements (functions can now be returned etc).
- Anonymous functions that can be defined inside other functions.
- Built-in JSON module is back.
- Lots and lots of new tests added, including output tests that test error messages.
- Multiple errors are now printed, the compiler no longer stops after the first error.
- The new JS backend using the AST parser (almost complete).
- Variadic functions.
- `net.websocket` module (early stage).
- `vlib` is now memory leak free, lots of `autofree` improvements.
- Simplified and cleaned up `cmd/v`, `v.builder`.
- V UI was updated to work with the new backend.


## V 0.1.25
*1 Apr 2020*

- The entire compiler has been re-written with an AST parser.
    The code is now a lot cleaner and more maintainable.
    ~15k lines of old compiler code were removed.

## V 0.1.24
*31 Dec 2019*

- A new parser/generator built on top of an AST that simplifies code greatly
    and allows to implement new backends much faster.
- Sum types (`type Expr = IfExpr | MatchExpr | IntegerLiteral`).
- B-tree map (sped up the V compiler by ~10%).
- `v fmt -w`.
- The entire code base has been formatted with vfmt.
- Generic structs.
- SDL module.
- Arrays of pointers.
- os: `is_link()`, `is_dir()`, `exists()`.
- Ranging through fixed size arrays.
- Lots of fixes in ORM and vweb.
- The first tutorial: [building a simple web application with vweb](https://github.com/vlang/v/blob/master/tutorials/building_a_simple_web_blog_with_vweb/README.md)
- Match expressions now must be exhaustive.
- freestanding: `malloc()`/`free()`.
- `++` is now required instead of `+= 1` for consistency.
- Interpolated strings now allow function calls: `println('val = $get_val()')`.
- `string.replace_each([])` for an efficient replacement of multiple values.
- More utf8 helper functions.
- `-prealloc` option for block allocations.
- `type` aliases.
- Running `v` with an unknown command will result in an error.
- `atof` implementation in pure V.
- Enums can now have negative values.
- New `filepath` module.
- `math.factorial`.
- `ftp` module.
- New syntax for casting: `val as Type`.
- Fewer libc functions used (soon V will have no dependency on libc).


## V 0.1.23
*30 Nov 2019*

- [Direct x64 machine code generation](https://github.com/vlang/v/issues/2849).
    Hello world being built in 3 milliseconds.
- Bare metal support via the `-freestanding` flag, to build programs without linking to libc.
- Prebuilt V packages for Linux, macOS, and Windows.
- `string.index()` now returns `?int` instead of `int/-1`.
- Lots of fixes in Generics.
- vweb framework for developing web applications is back.
- Vorum, the forum/blogging software written in vweb, can now be compiled and has been added to CI.
- REPL, `v up` have been split up into separate applications to keep the core V compiler small.
- V now enforces short enum syntax (`.green` instead of `Color.green`) when it's enough.
- V UI for macOS.
- Interfaces have been rewritten. `[]interface` support.
- `os.cp()` for copying files and directories.
- Additional compile-time flags: `$if clang, msvc, mingw, x32, x64, big_endian, little_endian {`.
- All C functions now have to be declared, all missing C functions have been defined.
- Global variables (only with the `-enable-globals` flag)
    for low level applications like kernels and drivers.
- Nothing can be cast to bool (previously code like `if bool(1) {` worked).
- `<<` and `>>` now work with all integer types.
- V detects Cygwin and shows an error (V supports Windows natively).
- Improved type checking of some operators (`%, |, &` etc).
- Windows 7 support.
- `println(true)` now prints `true` instead of `1`.
- `os.exec()` now uses `CreateProcess` on Windows.
- fast.vlang.io website for monitoring the performance of V after every commit.
- On Windows Visual Studio is now used automatically if GCC is not installed.
- vfmt!
- Lots of cleaning up in the compiler code.
- Multi-level pointers in unsafe code (`****int`).
- MSVC backtrace.
- `$if os {` blocks are now skipped on a different OS.
- C string literals (`c'hello'`).
- AlpineLinux/musl fixes + added to CI.
- Inline assembly.
- Clipboard module (Windows, macOS, X).
- `foo()?` syntax for error propagation.
- Docs have been migrated from HTML to `doc/docs.md`.
- `eventbus` module.
- Haiku OS support.
- `malloc/free` on bare metal.
- `utf8` helper functions (`to_lower()`, `to_upper()`, etc).
- Optimization of `for c in str {`.
- `string/array.left/right/slice/substr` were removed (use `[a..b]` slicing syntax instead).



## V 0.1.22
*28 Oct 2019*

- Generic functions (`fn foo<T>(bar T) T {`) with varargs support.
- `array[start..end]` and `string[start..end]` slicing syntax.
- Optimized `array.filter()` and `array.map()`.
- `sqlite` module.
- Cached modules for faster compilation.
- Dramatic compilation optimizations: [V now compiles itself in 0.10 - 0.30 seconds](https://github.com/vlang/v/wiki/The-V-language-now-compiles-itself-in-0.09-seconds)
- V scripts (simpler and cross-platform alternative to Bash).
- Infinite multi-dimensional arrays (`[][][]int`).
- `unsafe`.
- `[deprecated]` attribute.
- `[if]` function attributes for compile time function exclusion for performance.
- `switch` has been completely removed from the language and replaced by
`match` everywhere.
- `pub struct` and `pub const`, previously all structs and consts were public
by default.
- `musl` support (V can now run on, for example, Alpine Linux).
- Module header generation. V now supports closed source modules, which are still
used in some industries.
- Constants were added to typo suggestions.
- `color in [.green, .red, .blue]` now works without specifying `Color.green`.
- V compiler is now a module that can be used by other programs.
- Backtraces now have source lines on Linux.
- `runtime.nr_cpus()`.
- `fn init()` for module initialization.
- `a in [1, 2, 3]` optimization: no array gets allocated.
- Raw strings: `s := r'hello\nworld'`.
- `if a := func() { }` syntax for handling options.
- f32/f64 comparison now uses machine epsilon by default.


## V 0.1.21
*30 Sep 2019*

- `none` keyword for options.
- Solaris support.
- All table lookup functions now use `none`.
- varargs: `fn foo(bar int, params ...string) {`.
- Double quotes (`"`) can now also be used to denote strings.
- GitHub Actions CI in addition to Travis.
- `-compress` option. The V binary built with `-compress` is only ~90 KB!
- More memory management.
- Unused modules result in an error.
- "Unused variable/module" errors are now warnings in non-production builds.
- Duplicate methods with the same name can no longer be defined.
- Struct names must be capitalized, variable/function names must use snake_case.
- Error messages are now even nicer!
- Lots of fixes in automatic `.str()` method generation for structs and arrays.
- ~30% faster parser (files are no longer parsed separately for each pass).
- `_` is no longer a variable, but an actual syntax construct to skip unused values, like in Go.
- Multiple returns (`fn foo() (int, string) {`).
- `!` can now only be used with booleans.


## V 0.1.20
*17 Sep 2019*

- JavaScript backend!
- Hundreds of C warnings were fixed. `gcc v.c` now builds without
any warnings.
- The mutability check now applies to function args (mutable
receivers that are not modified result in a compilation error).
- V tests now show how long each test took.
- Official Android support (only console applications via Termux for now).
- Typo check. If a variable/function/module etc is misspelled,
V will suggest the correct name.
- Lots of Microsoft C fixes, and a separate Travis instance for
this backend.
- Bitwise operators `|`, `^`, `&` no longer work with booleans.


## V 0.1.19
*12 Sep 2019*

- Lots of refactoring, simplifications, and optimizations in the compiler.
- Experimental memory management at compilation (only for the V compiler itself for now).
- Lots of ORM fixes.
- Functions can now be inlined via the `[inline]` attribute.
- New `mysql` module.
- Better error format that is supported by all major editors (go to error).
- Error messages now point to the actual place where the error happened.
- Custom json field names: `struct User { last_name string [json:lastName] }`.
- Raw json fields via the `[raw]` attribute.
- All C code was removed from the `freetype` module.
- `gg` module can now render all Unicode characters.
- `[typedef]` attribute for imported C struct typedefs.
- Support of Objective C interfaces (primarily for using Cocoa).
- REPL: clear command and custom functions.
- REPL tests (which are also used for testing certain compiler errors).
- Syntax bug fixed: `foo[0] += 10` is now possible.
- http: support plain HTTP protocol and follow redirects.
- http: header data is now processed correctly.
- net: basic UDP support.
- `import const` was removed from the language.
- `array.contains()` was removed from the language (`in` should be used instead).
- `[0; len]` syntax was removed (replaced with a simpler `[0].repeat(len)`)
- Primitive aliases were removed to simplify the language.
- GitHub supports V now!
- Backtraces are now printed on panics.
- A new awesome `readline` module.
- V.c is now regenerated automatically after every commit.
- A bug with struct ordering was fixed, now structs can be declared in any order.
- V modules can now be built with `v build module`.
- `@FILE, @LINE, @FN, @COLUMN` for debugging.


## V 0.1.18
*16 Aug 2019*

- Built-in ORM (`uk_customers = db.select from Customer where country == 'uk' && nr_orders > 0`).
- Map initialization syntax: `m := { ‘foo’: ‘bar’, ‘baz’: ‘foo’ }`.
- `map.delete(key)`.
- `libcurl` dependency was removed from the `http` module.
- All function arguments are now immutable by default (previously they could be
  modified inside the function).
- `http` functions now return options.
- `sync.WaitGroup`.
- `vweb` static files serving.
- `crypto.rand` module.
- `v up` to update V.
- SChannel support on Windows.
- `net.urllib` module.
- vpm package manager, `v install`.
- `()` are now required in complex bool expressions: `(a && b) || c` instead of `a && b || c`.
- All arrays now have a default `.str()` method.
- Bootstrapping V with MSVC.
- Experimental `≠` etc support.
- `encoding.csv` module.
- `$if debug {` for running code in debug mode only.
- Map struct fields are now initialized automatically, just like arrays.
- Maps now support array values.
- `json` functions can no longer be used if the `json` module is not imported.


## V 0.1.17
*29 Jul 2019*
- `vweb` module for developing web apps in V.
- vtalk, open source V forum software.
- Generics (very limited right now, but they will be gradually improved).
- Comptime codegen (`foo.$method()` where `method` is a string).
- `@` for escaping keywords (e.g. `struct Foo { @type string }`).
- Windows Unicode fixes (V can now work with non-ASCII paths etc on Windows).
- Fix mutable args bugs + don't allow primitive arguments to be modified.
- Declaring a mutable variable and never modifying it results in a compilation error.
- Interactive debugging support.
- `sync` module for Windows.
- `#!` support on Unix systems (V scripts).
- Lots of Visual Studio fixes.
- `crypto.aes` and `crypto.rc4` modules.
- Internal modules.


## V 0.1.16
*23 Jul 2019*
- V can now be used with Visual Studio!
- Hot code reloading now works with graphical applications (e.g. graph.v, bounce.v).
- Compile time memory management for arrays.
- High order functions.
- `match` expression (replacing `switch`).
- Import cycle detection.
- `crypto/md5`, `crypto/sha256`, and `crypro/sha512` modules.
- `os.executable()` - a cross platform function that returns full path to current executable.
- `~/.vlang` and `VROOT` were removed entirely. The installation is a lot cleaner now.
- V can now be packaged for all Linux distros.
- Arch Linux package.
- `string(bytes_buffer, len)`, `string(bytes_array)` casts.
- Multiple `defer`s.
- `key in map` syntax (replacing `map.exists(key)`).


## V 0.1.15
*15 Jul 2019*
- FreeBSD, OpenBSD, NetBSD, DragonFly support.
- Hot reloading now works with graphical applications: [bounce.v](examples/hot_reload/bounce.v)
- VROOT was removed, the installation process is now much simpler.
- `defer` statement.
- map.v was re-written. It's now much faster.
- `for key, val in map` syntax.
- `flag` module for parsing command line arguments.
- `zip` module.
- `crypto/sha1` module.
- Submodules and module aliases (`import encoding.base64 as b64`).


## V 0.1.14
*12 Jul 2019*
- `gg` module Windows support, V Tetris runs on Windows.
- Compile `glad` and `cJSON` only once. Programs using `gg` or `json` compile a bit faster.
- `v.c` has been cleaned up and minimized (~16k => ~10k lines of code).
- `type` aliases can now have methods.
- Const overflow check during compilation (`byte(1000)` will no longer compile).


## V 0.1.13
*10 Jul 2019*
- New enum syntax (`token == .name`), enum values are no longer global consts.
- Submodules (`import encoding.base64`).
- Hot code reloading.
- Special `err` variable for getting error values.
- Complex numbers.
- `<<` can now append arrays (`numbers << [1, 2, 3]`).
- Lots of Windows fixes (Windows still needs some work).
- Lots of REPL improvements (e.g. `>> 2 + 3` works now, no `println` required).
- The website was made easily translatable, it's now partially available in several languages.


## V 0.1.12
*4 Jul 2019*
- V can finally compile itself on Windows (https://github.com/vlang/v#mingw-w64).
- `os` module now uses options in all functions that return `File`.
- Lots of bugs with options were fixed.
- `println` was optimized. It no longer results in allocations.
    Now it also works correctly with all integer types.
- Lots of `vfmt` fixes, it will be enabled tomorrow.
- New `strings` module.
- Lots of other fixes and improvements, thanks to all the contributors.


## V 0.1.11
*1 Jul 2019*
- Cross compilation for Windows!
- Lots of Windows fixes.
- socket.v.
- maps fixed.


## V 0.1.9 - 0.1.10
*29 Jun 2019*
- Windows support via MinGW-w64. Pre-built Windows binary.
- File structure has been simplified: all vlib modules were moved to the vlib/ directory,
  makefile was moved to the root.
- One single archive with pre-built binaries for all operating systems.
- `mut var := val` was fixed (previously `mut var = val` was allowed as well).


## V 0.1.8
*28 Jun 2019*
- Single file programs without `fn main` now work as expected.
- REPL has been fixed: it now supports imports, consts, function definitions, etc.


## V 0.1.7
*27 Jun 2019*
- All C code in the compiler and vlib has been replaced with V.
- `#` syntax for embedding C code has been removed.
- Exported functions now need to be marked with `pub`, all public vlib functions have been updated.
- CI has been set up (Travis + Azure). On every commit and PR it is made sure that V
  can compile itself, all tests pass, and all examples compile.
- More tests have been uploaded.
- Cleaner bytes to string conversion: `tos2(bytes)` => `string(bytes)`.
- The home page has 3 more examples next to 'hello world' that show the features of the language.
- Lots of bugs and issues fixed.