Fix inference issues with unconstrained base expr in `type_changing_struct_update` #97705

compiler-errors · 2022-06-03T19:56:15Z

Use fresh infer vars to guide inference along in type_changing_struct_update.

Fixes #96878

rust-highfive · 2022-06-03T19:56:18Z

r? @michaelwoerister

(rust-highfive has picked a reviewer for you, use r? to override)

michaelwoerister · 2022-06-07T09:56:51Z

r? rust-lang/compiler (do we have an alias for the types team?)

@nikomatsakis

inspired by rust-lang/rust#97705 (comment) > (do we have an alias for the types team?) cc @rust-lang/types -- I only added the members of t-types who are already on the reviewer rotation, specifically excluding @nikomatsakis and @spastorino since they aren't currently on the rotation. also add myself to diagnostics since i am a member of that wg, and move @cjgillot to the compiler team from the compiler team contributors grouping.

estebank · 2022-06-10T18:26:13Z

r? @lcnr

I'm r=me, but adding someone on the types team.

lcnr

lgtm r=me

there's one optional improvement i found, if you're interested in implementing that

lcnr · 2022-06-10T18:49:53Z

compiler/rustc_typeck/src/check/expr.rs

+                            self.tcx.mk_adt(*adt, fresh_substs),
+                            |_| {},
+                        );
+                        let base_ty = self.shallow_resolve(base_ty);
                        match base_ty.kind() {
                            ty::Adt(base_adt, base_subs) if adt == base_adt => {


can you now bug! if that isn#t the case? or at least delay_span_bug if it's ty::Error? would safe us 8 columns of indentation ^^

ironically, I don't think check_expr_has_type_or_error actually returns ty::Error when the expected type != the checked type of the input expr, hence us (still) needing to call report_mismatched_types on line before:1605/after:1624. I can easily check, though.

I will see if I can simplify this, though. It can at least be changed to a let-chain :)

lcnr

also, while you're in that file, can you change https://github.com/rust-lang/rust/blob/ac33d2b3e1359930a02653f0c61a124947912ed8/compiler/rustc_typeck/src/check/expr.rs#L1538 to not do a string comparison 😆

compiler-errors · 2022-06-11T17:41:50Z

I was able to turn the redundant report_mismatched_types into a span_bug! and I removed the string comparison with "union".

@bors r=lcnr

compiler-errors · 2022-06-11T17:59:44Z

wake up bors

@bors r=lcnr

bors · 2022-06-11T17:59:45Z

📌 Commit 5052911 has been approved by lcnr

bors · 2022-06-11T22:32:22Z

⌛ Testing commit 5052911 with merge e652caa...

bors · 2022-06-12T00:47:48Z

☀️ Test successful - checks-actions
Approved by: lcnr
Pushing e652caa to master...

rust-timer · 2022-06-12T02:08:42Z

Finished benchmarking commit (e652caa): comparison url.

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

Primary benchmarks: 🎉 relevant improvement found
Secondary benchmarks: no relevant changes found

	mean¹	max	count²
Regressions 😿 (primary)	N/A	N/A	0
Regressions 😿 (secondary)	N/A	N/A	0
Improvements 🎉 (primary)	-3.4%	-3.4%	1
Improvements 🎉 (secondary)	N/A	N/A	0
All 😿🎉 (primary)	-3.4%	-3.4%	1

Cycles

Results

Primary benchmarks: 😿 relevant regressions found
Secondary benchmarks: 😿 relevant regressions found

	mean¹	max	count²
Regressions 😿 (primary)	3.4%	5.8%	8
Regressions 😿 (secondary)	3.1%	4.4%	3
Improvements 🎉 (primary)	N/A	N/A	0
Improvements 🎉 (secondary)	N/A	N/A	0
All 😿🎉 (primary)	3.4%	5.8%	8

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

the arithmetic mean of the percent change ↩ ↩²
number of relevant changes ↩ ↩²

…_update_is_probably_complete, r=oli-obk Make `type_changing_struct_update` no longer an incomplete feature After rust-lang#97705, I don't see what would make it incomplete anymore. `check_expr_struct_fields` seems to now implement the RFC to the letter. r? `@nikomatsakis` cc `@rust-lang/types`

…_update_is_probably_complete, r=oli-obk Make `type_changing_struct_update` no longer an incomplete feature After rust-lang#97705, I don't see what would make it incomplete anymore. `check_expr_struct_fields` seems to now implement the RFC to the letter. r? ``@nikomatsakis`` cc ``@rust-lang/types``

…_update_is_probably_complete, r=oli-obk Make `type_changing_struct_update` no longer an incomplete feature After rust-lang#97705, I don't see what would make it incomplete anymore. `check_expr_struct_fields` seems to now implement the RFC to the letter. r? ```@nikomatsakis``` cc ```@rust-lang/types```

…_update_is_probably_complete, r=oli-obk Make `type_changing_struct_update` no longer an incomplete feature After rust-lang#97705, I don't see what would make it incomplete anymore. `check_expr_struct_fields` seems to now implement the RFC to the letter. r? ````@nikomatsakis```` cc ````@rust-lang/types````

…_update_is_probably_complete, r=oli-obk Make `type_changing_struct_update` no longer an incomplete feature After rust-lang#97705, I don't see what would make it incomplete anymore. `check_expr_struct_fields` seems to now implement the RFC to the letter. r? `````@nikomatsakis````` cc `````@rust-lang/types`````

…_update_is_probably_complete, r=oli-obk Make `type_changing_struct_update` no longer an incomplete feature After rust-lang#97705, I don't see what would make it incomplete anymore. `check_expr_struct_fields` seems to now implement the RFC to the letter. r? ``````@nikomatsakis`````` cc ``````@rust-lang/types``````

rust-highfive assigned michaelwoerister Jun 3, 2022

rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Jun 3, 2022

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 3, 2022

rust-highfive assigned estebank and unassigned michaelwoerister Jun 7, 2022

compiler-errors mentioned this pull request Jun 7, 2022

Set up rust-lang/types highfive alias rust-lang/highfive#405

Merged

rust-highfive assigned lcnr and unassigned estebank Jun 10, 2022

lcnr reviewed Jun 10, 2022

View reviewed changes

Guide inference along during type_changing_struct_update

6c00e54

compiler-errors force-pushed the guide-inference branch from ac33d2b to b524ba4 Compare June 11, 2022 16:57

compiler-errors added 2 commits June 11, 2022 10:24

Use if-let instead of match with guard

d9ddaf0

Stop using string equality to check if ADT is a union

5052911

compiler-errors force-pushed the guide-inference branch from f4ec06e to 5052911 Compare June 11, 2022 17:35

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 11, 2022

This was referenced Jun 11, 2022

Make type_changing_struct_update no longer an incomplete feature #97999

Merged

[NO MERGE] Enable type_changing_struct_update always (crater run) #98000

Closed

bors added the merged-by-bors This PR was explicitly merged by bors. label Jun 12, 2022

bors merged commit e652caa into rust-lang:master Jun 12, 2022

rustbot added this to the 1.63.0 milestone Jun 12, 2022

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Fix inference issues with unconstrained base expr in `type_changing_struct_update` #97705

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Fix inference issues with unconstrained base expr in type_changing_struct_update #97705

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Fix inference issues with unconstrained base expr in `type_changing_struct_update` #97705

Fix inference issues with unconstrained base expr in `type_changing_struct_update` #97705

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