First round of noncopyable constructs: Box, RigidArray, DynamicArray
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- Update minimum toolchain version to Swift 6.0. - Add a separate package manifest for Swift 6.2+. - Upgrade to Swift 6 language mode. - Except in _RopeModule, which has uncovered a language-mode related regression in debug builds. - Define availability macros. - Enable the Builtin module. - For the 6.2+ manifest: - Add a new package trait called “UnstableContainersPreview”. This is not yet functional. - Enable experimental language features `Lifetimes` and `InoutLifetimeDependence`. - Stop supporting COLLECTIONS_SINGLE_MODULE in package builds. - Update CMake & Xcode configurations to also assume Swift 6.2, reflecting the changes above.
This is just slapping `nonisolated(unsafe)` on global variables in the test suite. Our tests do not support concurrent execution.
In preparation of adding the public, noncopyable Box type
…ferPointer extensions
These are precursors for container protocols, referenced by the new array tests
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Our current 6.2 development snapshots are wildly out of date and do not have OutputSpan yet.
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Avoid using `@inlinable @_transparent` — the `@_transparent` attribute already implies inlinability, although evidently without the `@usableFromInline` parts. (`internal @_transparent` functions aren’t allowed to be called from inlinable functions.) `@usableFromInline @_transparent` or `@_alwaysEmitIntoClient @_transparent` expresses the author’s intention better, making the choice of exposing a symbol explicit.
Azoy
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Aug 26, 2025
I’m not convinced this has a real effect, but.
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This bumps the minimum required toolchain to Swift 6.0, and adds two new modules:
ArrayModuleandContainersPreview, and a (for now, dormant) new package traitUnstableContainersPreview, to enable source-unstable prototypes.ArrayModulewill ship preview versions of new, noncopyable array variants. We currently have two of these:RigidArrayandDynamicArray. Both are noncopyable, resizable array types with heap-allocated storage.DynamicArrayimplements dynamic storage resizing, whileRigidArrayrequires manual capacity management, and in exchange it provides more predictable runtime performance and memory use.ContainerPreviewwill ship source-unstable previews of new container protocols, providing a noncopyable/nonescapable-aware rethinking of Collection, focusing on predictably high performance. Initially, this is populated with the (planned to be source-stable)struct Box, a simple noncopyable, heap-allocated wrapper.Checklist