[Bug c++/67687] ICE initializing constexpr member with constexpr constructor

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67687

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
This is fixed in 7.1.0, I'm adding a testcase and closing the bug.