[Bug c++/123379] constexpr template for does not work with temporary std::span

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123379

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2026-01-03
             Status|UNCONFIRMED                 |NEW
             Blocks|                            |55004

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced without any includes testcase:
```
struct s
{
  const int *data;
  int size;
  template<int N>
  constexpr s(const int (&d)[N]):data(d), size(N){}
  constexpr const int *begin() const { return data;}
  constexpr const int *end() const{return data+size;}
};

static constexpr int data[] = {1, 2, 3};
void f(int);
int main() {
    template for (constexpr auto el : s(data))
        f(el);
}
```


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004
[Bug 55004] [meta-bug] constexpr issues