[Bug c++/92745] [8/9/10 Regression] Initializing array with vec4 results in compile error

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92745

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Better testcase:
template <typename a, int b> struct c { typedef a d[b]; };
template <typename a, int b> struct array {
  typename c<a, b>::d e;
  a operator[](long);
};
template<class T>
using vec4_t __attribute__((vector_size(4*sizeof(T)))) = float;
auto transpose(array<vec4_t<float>, 4> col)
{
  array<vec4_t<float>, 4>
    ret{vec4_t<float>{col[0][0], col[1][0], col[2][0], col[3][0]},
        vec4_t<float>{col[0][1], col[1][1], col[2][1], col[3][1]},
        vec4_t<float>{col[0][2], col[1][2], col[2][2], col[3][2]},
        vec4_t<float>{col[0][3], col[1][3], col[2][3], col[3][3]}};
  return ret;
}