[Bug c++/85128] Local scope type(def) falsely assumed to change meaning of outer scope type(def)

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85128

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
template <class T> class a;

struct b {
  typedef a<b> a;
};

Is the reduced testcase. The C++ standard is clear here about this case too. 

A diagnostic is not required either.  Gcc generates one as it can.