[Bug c++/90885] GCC should warn about 2^16 and 2^32 and 2^64

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90885

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Maybe we should accept 2**32 as extension ;)