Aaron Ballman af971365a2 Fix a diagnoses-valid in C++20 with variadic macros ...

C++20 and later allow you to pass no argument for the ... parameter in
a variadic macro, whereas earlier language modes and C disallow it.

We no longer diagnose in C++20 and later modes. This fixes PR51609.

2021-10-09 08:20:20 -04:00

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