A few fixes for placeholder types in interface types#84345

Merged

hamishknight merged 8 commits intoswiftlang:mainfrom

hamishknight:time-and-place

Sep 18, 2025

Commits on Sep 17, 2025

[Sema] Check for placeholders in extended type first
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[Sema] Ban placeholders in typed throws
hamishknight
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[AST] Override `getLocFromSource` for ParamDecl
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[AST] Preserve `HasPlaceholder` recursive property for GenericFunctionType
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[Sema] Only resolve PlaceholderType result for FuncDecl with body
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[CS] Record fix when encountering decl reference with placeholder type
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[Sema] Avoid resolving placeholders for protocol requirement params
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[Sema] Handle PlaceholderTypes in associated type inference
hamishknight
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