[Bug c++/125952] ICE with deducing-this function reference type used as template argument

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125952

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Shorter:

using U = void(&)(this int);

We also fail to reject

struct S {
  void (*f)(this S&);
  void (&r)(this S&);
};