[Bug c++/116020] New: Incorrect treatment of (this void) parameter

[fchelnokov at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116020

            Bug ID: 116020
           Summary: Incorrect treatment of (this void) parameter
           Product: gcc
           Version: 14.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fchelnokov at gmail dot com
  Target Milestone: ---

This C++23 program

struct A {
    void f(this void) {}
};

int main() {
    A{}.f();
}

is accepted by Clang, but GCC complains
> error: no matching function for call to 'A::f()'
> note:   candidate expects -1 arguments, 0 provided

Online demo: https://gcc.godbolt.org/z/hs6f8jv4h

Related discussion: https://stackoverflow.com/q/78773894/7325599