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

@param string $arg
Prepend an argument to the list of arguments to be passed to the program .