[Bug c++/80485] rejects-valid: constexpr static_cast of pointer-to-member-function to bool

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80485

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Created attachment 44167
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44167&action=edit
proposed fix

https://gcc.gnu.org/ml/gcc-patches/2018-05/msg00968.html