https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80943
--- Comment #1 from Barry Revzin <barry.revzin at gmail dot com> ---
Sorry, it's a bug, but not for the reasons I cited. Both T t(s) and T t{s}
should consider constructors - which should find T(S const& ) and T(T&& ) by
way of the conversion function. But the former is an exact match, so it should
be the one preferred.
