[Bug c++/112267] "inline function constexpr used but never defined" warning in SFINAE context

[falemagn at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112267

--- Comment #2 from Fabio Alemagna <falemagn at gmail dot com> ---
Sorry, "from int to auto" should have been "from bool to auto". You get the
point.