Sema: Relax primary associated type matching in matchExistentialTypes() [6.1] #78631
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Recently I found a soundness hole here, where we would allow conversion between `any P<T>` and `any Q<T>` even if P and Q have different primary associated types. However, the fix was too strict, because we still want to allow the conversion when the associated types have the same name. Fixes rdar://141968103.
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@swift-ci Please test |
hborla
approved these changes
Jan 14, 2025
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6.1 cherry-pick of #78559
Description: A fix for a soundness hole was too strict and broke source compatibility with existing valid code.
Origination: Regression first appeared in 6.1
Risk: Low.
Radar: rdar://141968103.
Reviewed by: @AnthonyLatsis and @xedin