[Bug c++/54835] [C++11][DR 1518] Explicit default constructors not respected during copy-list-initialization

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54835

--- Comment #16 from Jason Merrill <jason at gcc dot gnu.org> ---
Since the last meeting it has been suggested that this effect of DR 1630 was
unintended, and the testcase should be ill-formed.  So I've changed it back.