[Bug c++/83937] [7 Regression] C++17 binds braced init of a type T to default arg of a ctor instead of using T's own default ctor

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83937

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes but only on trunk, it's also a regression on gcc-7-branch.