isSpecial example

        parent::__construct([], ['name' => $name, 'is_defined_test' => false, 'ignore_strict_check' => false, 'always_defined' => false], $lineno);
    }

    public function compile(Compiler $compiler): void
    {
        $name = $this->getAttribute('name');

        $compiler->addDebugInfo($this);

        if ($this->getAttribute('is_defined_test')) {
            if ($this->isSpecial()) {
                $compiler->repr(true);
            } elseif (\PHP_VERSION_ID >= 70400) {
                $compiler
                    ->raw('array_key_exists(')
                    ->string($name)
                    ->raw(', $context)')
                ;
            } else {
                $compiler
                    ->raw('(isset($context[')
                    ->string($name)