drop(foo); // Now foo doesn't exist, it was dropped, thus unlocking anything which was kept locked while foo exists
If you feel that the name drop isn't helpful you can write your own function which consumes the guard, it needn't actually "do" anything with it - the whole point is that we moved the guard into this function, so, if the function doesn't return it or store it somewhere it's gone. This is why Destructive Move is the correct semantic and C++ "move" was a mistake.
