// build-pass (FIXME(62277): could be check-pass?) | |
// ignore-emscripten no i128 support | |
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<_>>()); | |
} |