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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
pub fn main() {
let mut v = ~[1, 2, 3];
assert!(v.position(|x| *x == 1) == Some(0));
assert!(v.position(|x| *x == 3) == Some(2));
assert!(v.position(|x| *x == 17) == None);
}
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