[Deserialization] Fix error when typealias required by protocol refers to type in @_implementationOnly module #37011
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…s to type in @_implementationOnly module In the added test case, the `typealias` refers to the `HiddenStruct` type in the private module, which is imported as `@_implementationOnly`. Because the import is `@_implementationOnly`, during deserialization, we don’t import the private module and hence any reference to the `HiddenStruct` type fails. In the common deserialization code path, this causes us to skip over the `typealias` member. However, when creating the protocol conformance, we assume that we can resolve the type to which the `typealias` refers and thus we are crashing. If `LangOpts.EnableDeserializationRecovery` is set to `true`, we should do our best to recover from such failures so this patch makes the deserialization failure handling more graceful and resolve the right-hand side of the `typealias` as an `ErrorType`. Fixes rdar://72891807
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@swift-ci Please test |
What are the conditions that this is true, could you clarify? |
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@bnbarham clarified this is 'true' by default. |
akyrtzi
approved these changes
Apr 22, 2021
xymus
approved these changes
Apr 22, 2021
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@swift-ci Please test Windows |
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In the added test case, the
typealiasrefers to theHiddenStructtype in the private module, which is imported as@_implementationOnly. Because the import is@_implementationOnly, during deserialization, we don’t import the private module and hence any reference to theHiddenStructtype fails. In the common deserialization code path, this causes us to skip over thetypealiasmember. However, when creating the protocol conformance, we assume that we can resolve the type to which thetypealiasrefers and thus we are crashing.If
LangOpts.EnableDeserializationRecoveryis set totrue, we should do our best to recover from such failures so this patch makes the deserialization failure handling more graceful and resolve the right-hand side of thetypealiasas anErrorType.Fixes rdar://72891807