IRGen: Don't hide noncopyable metadata from access functions in load-bearing mangled names. #84726
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mikeash
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Oct 7, 2025
…bearing mangled names. There is a compatibility hack where fallback metadata access functions used in field type metadata lie and say a field's type is the empty tuple when it's noncopyable and the runtime doesn't advertise compatibility with noncopyable types. Unfortunately, this hack applied to *all* fallback metadata access functions, causing us to return wrong metadata in situations we really need the correct metadata, such as in associated type substitutions. Constrain the hack to only apply to reflection metadata. Fixes rdar://161562839.
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There is a compatibility hack where fallback metadata access functions used in field type metadata lie and say a field's type is the empty tuple when it's noncopyable and the runtime doesn't advertise compatibility with noncopyable types. Unfortunately, this hack applied to all fallback metadata access functions, causing us to return wrong metadata in situations we really need the correct metadata, such as in associated type substitutions. Constrain the hack to only apply to reflection metadata. Fixes rdar://161562839.