[Bug c++/25751] Poor error when templating on undefined types

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25751

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
template<class> struct gg{};
int main(void)
{
  gg<t> v;
  v.begin();
}