Infinite iterators in for

language design
2

It probably doesn't need to be unsafe, really.

It could be something like

trait InfiniteIterator : Iterator {
    fn next_infinite(&mut self) -> Self::Item {
        self.next().expect("should have a value because it's an infinite iterator")
    }
}

Though that would need the desugaring to know it's infinite, and emit a loop instead of the usual while let.

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