[Bug c++/110837] New: ICE on non-friend default operator overloading

[stevenxia990430 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110837

            Bug ID: 110837
           Summary: ICE on non-friend default operator overloading
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stevenxia990430 at gmail dot com
  Target Milestone: ---

The following invalid program reports an internal compiler error. Failed on
gcc-trunk. 

To quickly reproduce: https://gcc.godbolt.org/z/eqjbxYhjs
```
#include <vector>

static constexpr int M = 100;
bool operator!= (std::array<int, M> const& lhs, std::array<int, M> const& rhs)
= default;

int main() {
}
```

note without default gcc does not crash with internal compiler error.