[NFC] VarDecls in Pattern Binding Initializers Have No Overload Type #27725
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Extend swiftlang#27668 by declining to validate the type of variables bound by a pattern binding initializer when computing an effective overload type while rooted at that initializer.
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CodaFi
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Oct 21, 2019
Resolve a cycle caused by overload resolution considering recursive static candidates where before it would silently reject them. In a world before the InterfaceTypeRequest, the overload resolution machinery would attempt to validate the declaration and would recieve a bad answer. This caused circular candidates to be ignored as a side effect. This behavior was partially restored by the fixes in swiftlang#27725 and swiftlang#27668 but that isn't enough for recursive static variables. Even if it were, the constraint fix kind doesn't make sense. Luckily, the right answer is to just reject recursive static VarDecl candidates entirely. Addresses rdar://56410015
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Extend #27668 by declining to validate the type of variables
bound by a pattern binding initializer when computing an effective
overload type while rooted at that initializer.