[Bug c/124303] C23: redeclaration of struct with function pointer with const pointer to struct as argument

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124303

--- Comment #1 from uecker at gcc dot gnu.org ---

Possibly because the function types are not recognizes as "the same" because
the struct is incomplete when it is constructed the first time.