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// check-pass
#![crate_type = "lib"]
fn checkpoints() -> impl Iterator {
Some(()).iter().flat_map(|_| std::iter::once(()))
}
fn block_checkpoints() -> impl Iterator {
checkpoints()
}
fn iter_raw() -> impl Iterator {
let mut iter = block_checkpoints();
(0..9).map(move |_| {
iter.next();
})
}
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