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// compile-pass
// ignore-emscripten no i128 support
#![feature(nll)]
fn fibs(n: u32) -> impl Iterator<Item=u128> {
(0 .. n)
.scan((0, 1), |st, _| {
*st = (st.1, st.0 + st.1);
Some(*st)
})
.map(&|(f, _)| f)
}
fn main() {
println!("{:?}", fibs(10).collect::<Vec<_>>());
}
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