[Bug c++/70543] [6 Regression] wrong non-const error for enable_if and constexpr function

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70543

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ppalka at gcc dot gnu.org

--- Comment #4 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Reduced further:

template <typename>
struct X
{
  template <unsigned int = 0>
  static constexpr int
  calc (void)
  {
    return 0;
  }

  static constexpr unsigned int value = calc ();     // <<<<<<<

  char foo[value];
};