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// Regression test for #22886.
fn crash_please() {
let mut iter = Newtype(Some(Box::new(0)));
let saved = iter.next().unwrap();
println!("{}", saved);
iter.0 = None;
println!("{}", saved);
}
struct Newtype(Option<Box<usize>>);
impl<'a> Iterator for Newtype { //~ ERROR E0207
type Item = &'a Box<usize>;
fn next(&mut self) -> Option<&Box<usize>> {
self.0.as_ref()
}
}
fn main() { }
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