Sema: Fix crash on circular reference in checkContextualRequirements() #32776
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The call to getGenericSignature() might return nullptr if we encounter a circular reference. Fixes <rdar://problem/64992293>.
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@swift-ci Please smoke test |
| public extension Wrapper where Content == Impl<WrapperParam> { | ||
| typealias WrapperParam = SomeProtocol | ||
| } | ||
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Slightly more reduced:
protocol SomeProtocol {}
struct G<T> {}
struct Wrapper<Content: SomeProtocol> {}
extension Wrapper where Content == G<Wrapper.WrapperParam> {
typealias WrapperParam = Never
}There was a problem hiding this comment.
The original test case came from a radar. I like to keep those mostly as-is, in case they uncover more bugs in the future.
AnthonyLatsis
approved these changes
Jul 9, 2020
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The call to getGenericSignature() might return nullptr if we encounter
a circular reference.
Fixes rdar://problem/64992293.