[Bug c++/95789] [10/11 Regression] Const method is allowed to return non-const reference on template class

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95789

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Another test:

// PR c++/96104

template <typename T> void fn(T &);
class E {};
struct F {
  template <typename T> void mfn(T t) { t, fn(E()); } // { dg-error "cannot
bind non-const lvalue reference" }
};
int
main()
{
  E e;
  F f;
  f.mfn(e);
}