[Bug c++/107439] use of static member function in requires-expression depends on declaration order

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107439

--- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> ---
So the question is if in C++20 mode we're allowed to reject ahead of time a
call to an unknown template-id with dependent template arguments and no
function arguments (as in the original testcase):

template<class T>
void f() {
  g<T>(); // OK? gcc rejects, clang/msvc accept
}