https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64446
--- Comment #1 from petschy at gmail dot com ---
One subtlety:
template<typename T=void>
struct Base3
{
};
struct Foo3 : Base3
{
};
In this case complaining about missing template params is probably
inappropriate, since Base3<> is perfectly valid.
So on second thought, the error should be about the missing <> after the class
name.
