[Concurrency] Prevent potential for condfail with owned task executor parameter #74929
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DougGregor
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Jul 3, 2024
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While the new parameter is added in a compatible way where code which does not refer to it will get a defaulted nil value; since we refer to a new parameter name in source, we need to guard it with a language feature -- as old compilers will not have this new name available. This should prevent a potential condfail issue.
Supported older compilers don't enable this feature by default, so it can't be omitted from the `_Concurrency` module's flags (regression from swiftlang#74543). Additionally, remove `@_allowFeatureSuppression(IsolatedAny)` from all declarations. We no longer need to support compilers that don't have the `IsolatedAny` feature, so the suppression is superfluous and the alternative branches didn't actually build anyways. _Additionally_, the suppressible feature logic could not handle suppressing `IsolatedAny` simultaneously with `SendingArgsAndResults`, resulting in a broken interface because `sending` was used outside `#if $SendingArgsAndResults` guards.
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Additional fixes I added after some testing:
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We noticed this issue while checking #74928 with @tshortli.
While the new parameter is added in a compatible way where code which
does not refer to it will get a defaulted nil value; since we refer to a
new parameter name in source, we need to guard it with a language
feature -- as old compilers will not have this new name available.
Fixes condfails that resulted from these recent PRs: #74000, #74543
Fixes rdar://131064807.