@Override
      public boolean equals(@Nullable MethodSignatureBackedByPsiMethod s1, @Nullable MethodSignatureBackedByPsiMethod s2) {
        return s1 == s2 || (s1 != null && s2 != null && s1.getMethod().equals(s2.getMethod()));
      }
@Override
      public boolean equals(@Nullable MethodSignatureBackedByPsiMethod s1, @Nullable MethodSignatureBackedByPsiMethod s2)