[Bug c++/71377] SFINAE expression compiles, but it should not because of 14.5.5p8

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71377

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Hmm, GCC 10.1.0, 10.2.0, and 10.3.0 all reject it but GCC 9.4.0 and 11.1.0
accepts it :).