[6.2] AST: Stop diagnosing potentially unavailable declarations in unavailable contexts #80707
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@available(macOS, unavailable, introduced: 15)
as just@available(macOS, unavailable)
because the introduction constraint was treated as lower priority and therefore superseded by the unavailability constraint. This caused a regression for the code that was written to work around the availability checker's strictness. The fix is to address this long standing issue and stop diagnosing potential unavailability in unavailable contexts.unavailable
for the target platform.