private function instrumentCode($code)
    {
        return $this->printer->prettyPrint($this->traverser->traverse($this->parse($code)));
    }
private function instrumentCode($code)
    {
        return $this->printer->prettyPrint($this->traverser->traverse($this->parse($code)));
    }
private function instrumentCode ( $ code ) { return $ this -> printer -> prettyPrint ( $ this -> traverser -> traverse ( $ this -> parse ( $ code ) ) ) ; }
Instrument code for timeit execution.

This inserts `markStart` and `markEnd` calls to ensure that (reasonably)
accurate times are recorded for just the code being executed.

@param string $code

@return string
Instrument code for timeit execution .