[6.2][Concurrency] Don't downgrade explicit isolation attribute clashes #82998
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The compiler shouldn't accept mismatch in explicit isolation attributes because it could lead to incorrect isolation selection. Resolves: rdar://155589753 (cherry picked from commit a9373c0)
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@swift-ci please test |
hborla
approved these changes
Jul 11, 2025
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@swift-ci please test macOS platform |
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@swift-ci please test macOS platform |
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Explanation:
The compiler shouldn't accept mismatch in explicit isolation attributes because it could lead to incorrect isolation selection.
Resolves: rdar://155589753
Main Branch PR: [Concurrency] Don't downgrade explicit isolation attribute clashes #82925
Risk: Low. This was never accepted before and our qualification uncovered no situations were with this change the compiler would produce an erorr.
Reviewed By: @gottesmm
Testing: Updated existing test-cases.
(cherry picked from commit a9373c0)