[DynamicCasts] Fix a bug in dynamic casting from optionals to protocols #16829
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Assume we have: Protocol P An intenal extension to Optional - conforming to P Compiling under whole module mode Use of Optional type T? Given a dynamic cast from T? to P, that cast might succeed even if T itself does not conform to P rdar://problem/40500142
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@swift-ci Please smoke test and merge |
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Assume we have:
Protocol P
An intenal extension to Optional - conforming to P
Compiling under whole module mode
Use of Optional type T?
Given a dynamic cast from T? to P, that cast might succeed even if T itself does not conform to P
rdar://problem/40500142