operator=( const already_AddRefed<T>& rhs )
operator=( const nsQueryInterfaceWithError& rhs )
      operator=( const already_AddRefed<T>& rhs )          // assign from |dont_AddRef(expr)|        {          assign_assuming_AddRef(rhs.mRawPtr);          NSCAP_ASSERT_NO_QUERY_NEEDED();          return *this;        }