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// run-pass
#![allow(unused_mut)]
#![allow(unused_variables)]
fn main() {
let mut shrinker: Box<dyn Iterator<Item=i32>> = Box::new(vec![1].into_iter());
println!("{:?}", shrinker.next());
for v in shrinker { assert!(false); }
let mut shrinker: &mut dyn Iterator<Item=i32> = &mut vec![1].into_iter();
println!("{:?}", shrinker.next());
for v in shrinker { assert!(false); }
}
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