The Rust version has that same tradeoff; the string can't be deallocated until all the tokens' lifetimes have ended. (In this particular use case, that's not re

The Rust version has that same tradeoff; the string can't be deallocated until all the tokens' lifetimes have ended. (In this particular use case, that's not really a cost, since you probably need to keep the string available the whole time anyway.) Go, which is garbage-collected, also does the slice-by-reference trick (but fails criterion #1 because it doesn't really have iterators).