Shafik Yaghmour b364535304 [Clang] Diagnose ill-formed constant expression when setting a non fixed enum to a value outside the range of the enumeration values ...

DR2338 clarified that it was undefined behavior to set the value outside the
range of the enumerations values for an enum without a fixed underlying type.

We should diagnose this with a constant expression context.

Differential Revision: https://reviews.llvm.org/D130058

2022-07-28 15:27:50 -07:00

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