1..n is an iterator. The while loop is torturing the poor language - it is using the wrong tools to achieve a goal that is much better achieved using the things it does have direct semantic support for.
As for the while loop "torturing the poor language" - that's you injecting some preference. It's perfectly valid rust, and there's plenty of situations that look close to what I wrote (albeit my example was distilling down those cases to the core) and which aren't easily achievable without contortion to get everything into an iterator.
Don't get me wrong - I really like iterators. Sometimes though, iterators add obfuscation, particularly after the 5th or 6th chained iterator method.
So just as Rust's "for" is syntactic sugar, so is "while", it will de-sugar into loop with an exit condition break at the start, since that's how while works in Rust.
But this sort of illustrates how limited your model is, you're assuming the way loops worked in some language you've more experience with, probably C, is just "how loops work" but it's a weird feature of one language invented decades before the present, but decades after the fundamentals. It's like fixating on how the brakes worked on the 1971 Ford Cortina. That's not "how car brakes work" it's just how the brakes worked on that particular model of car, a brand new BMW i4 and a Model T are both equally reasonable examples of "how car brakes work".