27 lines
741 B
Rust
27 lines
741 B
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// compile-pass
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#![feature(nll)]
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fn fibs(n: u32) -> impl Iterator<Item=u128> {
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(0 .. n)
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.scan((0, 1), |st, _| {
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*st = (st.1, st.0 + st.1);
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Some(*st)
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})
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.map(&|(f, _)| f)
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}
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fn main() {
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println!("{:?}", fibs(10).collect::<Vec<_>>());
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}
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