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

[raphaelsc at scylladb dot com]

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

--- Comment #1 from Raphael S. Carvalho <raphaelsc at scylladb dot com> ---
another interesting example which shows the bug: https://godbolt.org/g/nMdPBF