Pinq\Expressions\Expression::index PHP Method

    public static final function index(Expression $value, Expression $index = null)
    {
        return new IndexExpression($value, $index);
    }

 /**
  * @dataProvider parsers
  */
 public function testNestedVariableTraversal()
 {
     $function = function () {
         $i->field->method()['index'];
     };
     $this->assertParsedAs($function, [O\Expression::index(O\Expression::methodCall(O\Expression::field(self::variable('i'), O\Expression::value('field')), O\Expression::value('method')), O\Expression::value('index'))]);
 }