[Bug c++/65072] Segfault when parsing dectlype in trailing return type

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65072

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
And clang accepts it.

It looks like we don't need the C<> around decltype:

template <typename> class C
{
  struct
  {
    int i;
  };
  auto operator*(const C m) -> decltype (m.i);
};
void fn1 (const C<float>);
C<float> a;

This one is accepted by clang, gcc 5/4.9/4.8 ICE.