[Bug c++/103401] New: gcc accepts decltype(auto(0)) as the parameter of the function

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103401

            Bug ID: 103401
           Summary: gcc accepts decltype(auto(0)) as the parameter of the
                    function
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

It seems that gcc should not accept this strange syntax, although I don't know
why f has two template parameters..

void f(decltype(auto(0))) { }

int main() {
  f<int,int>(0);
}

https://godbolt.org/z/PaevrsrE8