fn pairwise_sub<T:DoubleEndedIterator<Item=isize>>(mut t: T) -> isize {
    let mut result = 0;
    loop {
        let front = t.next();
        let back = t.next_back();
        match (front, back) {
            (Some(f), Some(b)) => { result += b - f; }
            _ => { return result; }
        }
    }
}
// Copyright 2014 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.


Licensed under the Apache License, Version 2.0  or the MIT license
, at your
option. This file may not be copied, modified, or distributed
except according to those terms.
Licensed under the Apache License Version 2 . 0 or the MIT license at your option . This file may not be copied modified or distributed except according to those terms .
fn pairwise_sub<T:DoubleEndedIterator<Item=isize>>(mut t: T) -> isize {
    let mut result = 0;
    loop {
        let front = t.next();
        let back = t.next_back();
        match (front, back) {
            (Some(f), Some(b)) => { result += b - f; }
            _ => { return result; }
        }
    }
}
fn pairwise_sub < T : DoubleEndedIterator < Item = isize > > ( mut t : T ) -> isize { let mut result = 0 ; loop { let front = t . next ( ) ; let back = t . next_back ( ) ; match ( front , back ) { ( Some ( f ) , Some ( b ) ) => { result += b - f ; } _ => { return result ; } } } }
Copyright 2014 The Rust Project Developers.
Copyright 2014 The Rust Project Developers .
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