[Bug libstdc++/58605] atomic<T>::atomic() disobeys [atomics.types.operations.req]p4 for types with user-defined default constructors

[jyasskin at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58605

--- Comment #2 from Jeffrey Yasskin <jyasskin at gcc dot gnu.org> ---
Thanks, Daniel. I think it would be totally reasonable to call this a bug in
C++ rather than a bug in libstdc++.