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//@ run-pass
// Regression test for #49685: drop elaboration was not revealing the
// value of `impl Trait` returns, leading to an ICE.
fn main() {
let _ = Some(())
.into_iter()
.flat_map(|_| Some(()).into_iter().flat_map(func));
}
fn func(_: ()) -> impl Iterator<Item = ()> {
Some(()).into_iter().flat_map(|_| vec![])
}
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