`$new_file->touch($old_file)` should be a shortcut for `$new_file->touch($old_file->stat->mtime)` like the `-r` option for the Linux `touch` command does.
$new_file->touch($old_file)should be a shortcut for$new_file->touch($old_file->stat->mtime)like the-roption for the Linuxtouchcommand does.