[Bug c++/65985] compiler segfault with assert() in constexpr constructor body

[rhalbersma at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65985

--- Comment #1 from rhalbersma <rhalbersma at gmail dot com> ---
See also LWG active issue 2234
http://cplusplus.github.io/LWG/lwg-active.html#2234