original_string: public function prependArg($arg)
      {
          Assertion::string($arg);
          $this->args = $this->args->prepend($arg);
      }
code: public function prependArg($arg)
      {
          Assertion::string($arg);
          $this->args = $this->args->prepend($arg);
      }
code_tokens: public function prependArg ( $ arg ) { Assertion :: string ( $ arg ) ; $ this -> args = $ this -> args -> prepend ( $ arg ) ; }
docstring: Prepend an argument to the list of arguments to be passed to the program.
  
  @param string $arg
docstring_tokens: Prepend an argument to the list of arguments to be passed to the program .