private boolean existsInSuperClass(PsiElement classMember) {
      if (!(classMember instanceof PsiMethod method)) return false;
      if (myInterfaceContainmentVerifier.checkedInterfacesContain(method)) return true;
      if (mySuperClass == null) return false;
      final PsiMethod methodBySignature = mySuperClass.findMethodBySignature(method, true);
      return methodBySignature != null;
    }
private boolean existsInSuperClass(PsiElement classMember)