[Bug c++/99970] gcc accepts invalid comparison between pointer and integer in requires-clause

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99970

--- Comment #1 from 康桓瑋 <hewillk at gmail dot com> ---
The requires-expression is a red herring, so it can be simplified to:

template <auto x = 0>
void f() { x == nullptr; };

int main() { 
  f(); 
}

Is this ill-formed?