Allow '@unsafe' on import declarations to silence '@preconcurrency' warning #82443
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…arning '@preconcurrency' imports open up memory safety holes with respect to Sendable, which are diagnosed under strict memory safety + strict concurrency checking. Allow one to write '@unsafe' on those imports to silence the diagnostic about it.
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'@preconcurrency' imports open up memory safety holes with respect to Sendable, which are diagnosed under strict memory safety + strict concurrency checking. Allow one to write '@unsafe' on those imports to silence the diagnostic about it.
Fixes rdar://154147698