This function returns the remaining command line arguments after
you have run find_option() or find_all_options() to find
all the options in the argument list. If there are any options
left not handled by find_option() or find_all_options()
this function will fail.
If throw_errors has been specified get_args() will throw errors
on failure. If it has been left out, or is 0 (zero), it will
instead print an error message on Stdio.stderr and exit the
program with result code 1 on failure.