https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60027
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That's unfortunate, I much prefer the Clang and EDG behaviour, which is to
resolve the ambiguity in favour of the converting constructor.
In the Clang bug Ed links to https://wg21.link/cwg1228
So this is INVALID.