Who contributed to Mobile platforms on May 24, 2026?

3 developers shipped this update, including DougGregor, a-viv-a, and AnthonyLatsis.

What were the notable Mobile platforms updates?

Merge pull request #89356 from tshortli/safe-task-cancel, [AST] Make RawComment handling robust against source files changing from underneath us, and [Sema] Map conformance types into generic env before sendable checking.

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The Wire · Showcase

SWIFT KILLS UNSAFE TASK.CANCEL(), DART SDK ROLLS CONTINUE

By RepoJournal · Filed 06:03 UTC on May 24, 2026 · About Mobile platforms

3 people shipped this

DougGregor @DougGregor 1 cited

a-viv-a @a-viv-a 1 cited

AnthonyLatsis @AnthonyLatsis 1 cited

Swift removed an unnecessary unsafe marker from Task.cancel() while tightening sendable type checking, as Flutter tracks two consecutive Dart SDK updates overnight.

The Swift team merged a critical concurrency fix that eliminates unsafe code from Task.cancel() [1], reducing the surface area for potential safety violations in concurrent code. This lands alongside a more robust AST layer that now handles source file mutations gracefully [2], fixing crashes when .swiftsourceinfo files drift out of sync with source. On the type-safety front, sendable checking now properly maps conformance types into their generic environments [3], closing a hole where type parameters were incorrectly treated as trivially conforming. The build system also gained control over pedantic diagnostics with new build-script flags [4], letting engineers toggle extra warnings independently from assertions. Meanwhile, Flutter's Dart SDK roller pushed two incremental updates to 3.13.0-133.0.dev and 3.13.0-134.0.dev overnight [5] [6], both standard maintenance rolls with revert mechanisms in place if breakage surfaces.

Action items

→ Review Swift changes for Task.cancel() if you use concurrent patterns in production code apple/swift [plan]
→ Monitor Dart SDK rolls for breakage; revert through autoroll controls if your Flutter build fails flutter/flutter [monitor]
→ Evaluate new sendable type checking behavior in Swift against your generic protocol conformances apple/swift [plan]

References

[1] Merge pull request #89356 from tshortli/safe-task-cancel apple/swift
[2] [AST] Make RawComment handling robust against source files changing from underneath us ↗ apple/swift
[3] [Sema] Map conformance types into generic env before sendable checking ↗ apple/swift
[4] build-script: Add a flag to control pedantic diagnostics ↗ apple/swift
[5] Roll Dart SDK from 7e0f28eb5315 to 7eb54169841d (1 revision) (#187005) flutter/flutter
[6] Roll Dart SDK from 90e55fa88456 to 7e0f28eb5315 (1 revision) (#186990) flutter/flutter

Quick answers

What shipped in Mobile platforms on May 24, 2026?: Swift removed an unnecessary unsafe marker from Task.cancel() while tightening sendable type checking, as Flutter tracks two consecutive Dart SDK updates overnight. In total, 9 commits and 9 pull requests landed.
Who contributed to Mobile platforms on May 24, 2026?: 3 developers shipped this update, including DougGregor, a-viv-a, and AnthonyLatsis.
What were the notable Mobile platforms updates?: Merge pull request #89356 from tshortli/safe-task-cancel, [AST] Make RawComment handling robust against source files changing from underneath us, and [Sema] Map conformance types into generic env before sendable checking.

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