[Bug c++/113854] the expression 'is_invocable_v ... evaluated to 'false'

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113854

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*unintended symptom deep inside a template