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CHANGELOG: 1.0.20 upgrade note for Xcode 27 consumers with stale pointfree pins #79

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mansbernhardt merged 1 commit into from
Sep 15, 2026
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CHANGELOG: 1.0.20 upgrade note for Xcode 27 consumers with stale pointfree pins #79

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Expand Up @@ -19,6 +19,8 @@ All notable changes are documented here. The format follows [Keep a Changelog](h

Verified with the full suite on both Xcode 26 (6.3.3 → `xctest-dynamic-overlay` 1.13.1) and Xcode 27 (6.4 → `swift-issue-reporting` 2.1.0), and by parallel-phoenix-apple's `StudioPreview` / `StreamsApp` schemes building on Xcode 27 against the patched package.

**Upgrade note for Xcode 27 / Swift 6.4 consumers.** The switch only removes the second identity if *every* declarer in your graph has moved. Older releases of other pointfree packages declare `xctest-dynamic-overlay` unconditionally — `swift-clocks` < 1.1.1, `swift-custom-dump` < 1.7.3, `swift-snapshot-testing` < 1.19.4 are the ones we hit — and a `Package.resolved` that still pins one of those fails on 6.4 with *"multiple packages ('swift-issue-reporting', 'xctest-dynamic-overlay') declare products with a conflicting name: 'IssueReportingTestSupport'"*. `swift package update` did **not** move those pins in our checkout; deleting `Package.resolved` (and `.build`, or Xcode's package cache via *File ▸ Packages ▸ Reset Package Caches*) and resolving fresh did. Check with `grep xctest-dynamic-overlay Package.resolved` — on 6.4 it should not be there.

### Tests

- **The test suite compiles on Swift 6.4 (Xcode 27.0).** 6.4's region-isolation checker rejects two `withTaskCancellationHandler` call sites in `CancellationTests` and `InheritCancellationContextTests` ("passing closure as a `sending` parameter risks causing data races"): the `onCancel` closure implicitly captured a `LockIsolated` counter that the enclosing `model.task { }` closure also uses, and the checker merges the two closures' regions. An explicit `[$count]` / `[$cancelCount]` capture list gives `onCancel` its own copy of the (Sendable) reference and the checker is satisfied. No behavioural change; the library itself already compiled on 6.4 once 1.0.19 landed.
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