[6.2][Diagnostics] A collection of diagnostic fixes/improvements#81945

Merged

xedin merged 12 commits intoswiftlang:release/6.2from

xedin:various-diagnostic-fixes-6.2

Jun 4, 2025

Commits on Jun 3, 2025

[Diagnostics] Don't attempt to force unwrap invalid optional chaining in the argument position
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[Diagnostics] Use argument mismatch fix for `@autoclosure` result positions
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[Diagnostics] Diagnose existential mismatch in a literal collection element position
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[Diagnostics] Assign missing member eagerly when there is no context
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[CSSimplify] Detect when generic argument mismatch applies to argument and produce a tailed fix
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[CSSimplify] Move `inout` failures handing to `LValueConversion` block
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[CSSimplify] Remove ad-hoc optional mismatch handling for arguments
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[CSDiagnostics] Attempt fix-its for contextual generic argument mismatches
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[CSSimplify] Increase impact of a generic argument mismatch if mismatch is contextual
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[CSSimplify] Fix `matchDeepEqualityTypes` to allow fixing of optionals
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[CSSimplify] Produce tailored fixes for a few generic argument mismatches
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[Tests] NFC: Update all of the test-cases improved by changes to generic argument mismatch handling
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