[Bug preprocessor/60875] `_Pragma("message \"foo\")"` doesn't work in expression contexts.

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60875

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Those pragmas are all extensions, so the standard doesn't cover them.