@NotNull
    private static Maybe<PyCallable> filterNonStubExpression(@NotNull Maybe<PyCallable> maybeCallable) {
      final PyCallable callable = maybeCallable.valueOrNull();
      if (callable != null) {
        if (!(callable instanceof StubBasedPsiElement)) {
          return UNKNOWN_CALL;
        }
      }
      return maybeCallable;
    }
@NotNull
    private static Maybe<PyCallable> filterNonStubExpression(@NotNull Maybe<PyCallable> maybeCallable)