[Bug libstdc++/80064] [7 Regression] _Iter_cmp_iter instantiates bogus type

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80064

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
#include <algorithm>
#include <vector>
bool greater(int, int);
int main()
{
  std::vector<int> v;
  std::make_heap<std::vector<int>::iterator, bool (int, int)>
     (v.begin(), v.end(), greater);
}