ArrayExpression example

if (empty($parameters)) {
                    break;
                } else {
                    $missingArguments[] = $name;
                }
            } else {
                throw new SyntaxError(sprintf('Value for argument "%s" is required for %s "%s".', $name, $callType, $callName), $this->getTemplateLine(), $this->getSourceContext());
            }
        }

        if ($isVariadic) {
            $arbitraryArguments = $isPhpVariadic ? new VariadicExpression([], -1) : new ArrayExpression([], -1);
            foreach ($parameters as $key => $value) {
                if (\is_int($key)) {
                    $arbitraryArguments->addElement($value);
                } else {
                    $arbitraryArguments->addElement($value, new ConstantExpression($key, -1));
                }
                unset($parameters[$key]);
            }

            if ($arbitraryArguments->count()) {
                $arguments = array_merge($arguments, $optionalArguments);
                

$expr = new ConcatBinary($expr, $node, $node->getTemplateLine());
        }

        return $expr;
    }

    public function parseArrayExpression()
    {
        $stream = $this->parser->getStream();
        $stream->expect(/* Token::PUNCTUATION_TYPE */ 9, '[', 'An array element was expected');

        $node = new ArrayExpression([], $stream->getCurrent()->getLine());
        $first = true;
        while (!$stream->test(/* Token::PUNCTUATION_TYPE */ 9, ']')) {
            if (!$first) {
                $stream->expect(/* Token::PUNCTUATION_TYPE */ 9, ',', 'An array element must be followed by a comma');

                // trailing ,?                 if ($stream->test(/* Token::PUNCTUATION_TYPE */ 9, ']')) {
                    break;
                }
            }
            $first = false;