code: public function look($number = 1)
      {
          if (!isset($this->tokens[$this->current + $number])) {
              throw new Twig_Error_Syntax('Unexpected end of template.', $this->tokens[$this->current + $number - 1]->getLine(), $this->source);
          }
  
          return $this->tokens[$this->current + $number];
      }
docs: Looks at the next token.
  
  @param int $number
  
  @return Twig_Token