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#Rustlang iterators are evaluated lazily, so they don't do anything until they're used to produce a value (e.g. `next()`, `collect()`, `count()` or `for i in iter {}`)
There's no "for_each()" method to just run an iterator without getting values out of it. Use `for _ in iter {}` instead.
for_each is a thing now! https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.for_each