[Bug c++/80979] ice in lookup_mark, at cp/tree.c:2298

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80979

--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Reduced C++ source code:

namespace a class address {          
friend bool operator==(const address &, const address &}
        bool operator==(const address &, const address &;
}
class b {
  a::address address
} class h {
  typedef b c
} namespace boost struct B {
} namespace i B d;
}
}
using namespace boost : i namespace boost namespace e class f;
         template < g > void operator==(const , f ;
         }
         using e::operator==
         }
         h : c from {
           d == from.address