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//@ run-pass
fn main() {
let v = vec![1, 2, 3];
let boxed: Box<dyn Iterator<Item=i32>> = Box::new(v.into_iter());
assert_eq!(boxed.max(), Some(3));
let v = vec![1, 2, 3];
let boxed: &mut dyn Iterator<Item=i32> = &mut v.into_iter();
assert_eq!(boxed.max(), Some(3));
}
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