GraphQL\Tests\Validator\UniqueArgumentNamesTest::duplicateArg PHP Method

    private function duplicateArg($argName, $l1, $c1, $l2, $c2)
    {
        return FormattedError::create(UniqueArgumentNames::duplicateArgMessage($argName), [new SourceLocation($l1, $c1), new SourceLocation($l2, $c2)]);
    }