Corentin Jabot bdeda959ab Make wide multi-character character literals ill-formed ...

This implements P2362, which has not yet been approved by the
C++ committee, but because wide-multi character literals are
implementation defined, clang might not have to wait for WG21.

This change is also being applied in C mode as the behavior is
implementation-defined in C as well and there's no benefit to
having different rules between the languages.

The other part of P2362, making non-representable character
literals ill-formed, is already implemented by clang

2021-08-20 11:10:53 -04:00

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