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Drop remaining Swift 6.2 support. #1481

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Drop remaining Swift 6.2 support. #1481

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@grynspan grynspan commented Jan 13, 2026 •
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This PR removes compatibility shims etc. for the Swift 6.2 toolchain. Our main branch now requires a Swift 6.3 toolchain to build.

Do not merge this PR to release/6.3 as it will not work with the Swift 6.2 toolchain.

Checklist:

  • Code and documentation should follow the style of the Style Guide.
  • If public symbols are renamed or modified, DocC references should be updated.

@grynspan
Drop remaining Swift 6.2 support.
70e81ac 
This PR removes compatibility shims etc. for the Swift 6.2 toolchain. Our main
branch now requires a Swift 6.3 toolchain to build.
@grynspan grynspan added this to the Swift 6.4.0 (main) milestone Jan 13, 2026
@grynspan grynspan self-assigned this Jan 13, 2026
@grynspan grynspan added integration ⚙️ Integrating work to release branches tech-debt 💾 reduces technical debt labels Jan 13, 2026
stmontgomery
stmontgomery reviewed Jan 13, 2026
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.github/workflows/main_using_release.yml
@@ -1,4 +1,4 @@
name: main branch, 6.2 toolchain
name: main branch, 6.3 toolchain
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@stmontgomery stmontgomery Jan 13, 2026

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So glad I (intentionally) refrained from naming this file main_using_release_6.2.yml :)

@grynspan grynspan mentioned this pull request Jan 14, 2026
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@grynspan
Merge branch 'main' into jgrynspan/drop-6.2-support-on-main
cfecdef
@grynspan
Remove workaround for fatalError() call in Mutex trylock function.
62eefca 
This PR removes a workaround for an errant `fatalError()` call in the Linux
implementation of `Mutex.withLockIfAvailable()`. That call was removed by
swiftlang/swift#85448 which is in the Swift 6.3 and
6.4-dev (main) branches.
@grynspan
Merge branch 'main' into jgrynspan/drop-6.2-support-on-main
1278bff
@grynspan
Use package tools version 6.2 for now as that's the latest that ships…
9026d72 
… with Xcode
@grynspan grynspan requested a review from stmontgomery January 17, 2026 03:29
@grynspan grynspan marked this pull request as ready for review January 17, 2026 03:30
@grynspan grynspan mentioned this pull request Jan 20, 2026
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@stmontgomery stmontgomery Awaiting requested review from stmontgomery stmontgomery is a code owner

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integration ⚙️ Integrating work to release branches tech-debt 💾 reduces technical debt

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