Existential Types Cannot Satisfy Superclass Bounds #58624
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It is not the case that `any P` satisfies a class bound even if the existential is a composition with an exact match to the class bound. The resulting existential box must be opened as the exact class type before this conversion can succeed. This appears to be a regression from Swift 5.1, which was the last Swift compiler that banned this typing rule. rdar://92358570
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@swift-ci test source compatibility |
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It is not the case that
any Psatisfies a class boundeven if the existential is a composition with an exact
match to the class bound. The resulting existential box
must be opened as the exact class type before this conversion
can succeed.
This appears to be a regression from Swift 5.1, which was the last
Swift compiler that banned this typing rule.
rdar://92358570