[5.9] Sema: Diagnose @backDeployed on functions with opaque result types
#66677
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Sometimes it's useful to be more lenient when type checking swiftinterfaces since restrictions that could be dropped in the future will manifest in resilient libraries being incompatible with older compilers otherwise.
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The compiler does not yet implement support for back deploying opaque result types. Resolves rdar://110806234
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@backDeployed on functions with opaque result types@backDeployed on functions with opaque result types
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🍒 release cherry pick
nkcsgexi
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Jun 16, 2023
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@_alwaysEmitIntoClientworks as an alternative.@backDeployedattribute.@backDeployedon functions with opaque result types #66673.