[5.9] [Macros] Tighten declaration semantics and improve expansion of freestanding macros#66527

Merged

DougGregor merged 6 commits intoswiftlang:release/5.9from

DougGregor:freestanding-macro-cleanups-5.9

Jun 10, 2023

Commits on Jun 10, 2023

[Macros] Only freestanding expression macros can have a non-Void result type
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[Macros] Provide the freestanding macro role for expansion operations.
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Diagnose macros that have multiple freestanding macro roles.
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[Macros] Tighten restriction on non-expression macros not having return types
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[AST printer] Stop printing `-> ()` types on all macro declarations.
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[Macros] Downgrade "void return for non-expression macro" error in interfaces
DougGregor
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