[Bug c++/78894] [7 Regression] [c++17] ICE for std::list template deduction from std:: initializer_list

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78894

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Ah, but I'm wrong about the initializer-list constructor.
http://wg21.link/p0512r0 made changes that make it valid (but our
implementation might not have those changes yet).