SE-0340: noasync availability kind
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noasync availability kindnoasync availability kind
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This patch adds the `noasync` availability kind to `@available`. The spelling is `@available(*, noasync)`.
This patch adds validation to ensure that the noasync attribute is only applied to useful declarations. Specifically, the `noasync` attribute cannot be applied to `deinit` declarations, asynchronous functions, or asynchronous properties.
Needed to add availability information for macOS, iOS, and watchOS to avoid emitting unintended errors on the `async` keyword.
Verify importing noasync across modules works correctly.
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Add
noasyncavailability kind to the@availableattribute. This is moving the checking from the@_unavailableFromAsyncattribute over to availability checking. There are additional features here including handling unavailability on different platforms, a message, and renaming function calls.This implements SE-0340 Swift noasync.