It's idiomatic in rust to use iterators rather than loops. When it comes to iterators that for example iterate over a vector/array, there is no bounds-checking.

It's idiomatic in rust to use iterators rather than loops. When it comes to iterators that for example iterate over a vector/array, there is no bounds-checking. I don't know if that is implemented by explicitly opting out of the bounds checking in the implementation of the iterator, or by some other means. In either case, bounds checking is turned off when the "looping" is encapsulated in iterators, but not for arbitrary indexing (which is a good reason not to use explicit indexing when you don't have to, of course).