[Bug c++/114163] Calling member function of an incomplete type compiles in gcc and does not compile in clang and msvc

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114163

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
https://wg21.link/CWG1836
https://eel.is/c++draft/expr.ref#4