[Bug c++/63924] Constexpr constructible expression "is not constexpr" when used in a template non-type argument

[mouchtaris at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63924

--- Comment #1 from Nikos <mouchtaris at gmail dot com> ---
Special thanks and kudos to "T.C." for helping figuring this out:

http://stackoverflow.com/questions/25465379