[Bug libstdc++/58338] Add noexcept to functions with a narrow contract

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58338

--- Comment #13 from Paolo Carlini <paolo.carlini at oracle dot com> ---
In any case I see that the issue with explicit instantiation is recorded in
2193. Let's see what happens in EWG.