Fix @_implements type resolution diagnostics
#81421
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If a type in an `@_implements` attribute failed to resolve, Sema would assume it was because the type existed but wasn’t a protocol, even if there was another reason for the problem (such as the type not existing). Explicitly resolve the TypeRepr again through a path that will produce diagnostics.
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@swift-ci please test |
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@slavapestov As the engineer who requestified |
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If a type in an
@_implementsattribute failed to resolve, Sema would assume it was because the type existed but wasn’t a protocol, even if there was another reason for the problem (such as the type not existing). Explicitly resolve the TypeRepr again through a path that will produce diagnostics.Extracted from (an unpushed rebase of) #34556.