[Bug c++/55425] constexpr does not work in many situations (both built-in and user supplied literals)

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55425

--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Uhm, in fact probably it should be accepted with -std=c++11 too, let's wait a
second.