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// Copyright 2012 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.
// run-pass
#![allow(non_camel_case_types)]
trait sum {
fn sum_(self) -> isize;
}
// Note: impl on a slice
impl<'a> sum for &'a [isize] {
fn sum_(self) -> isize {
self.iter().fold(0, |a, &b| a + b)
}
}
fn call_sum(x: &[isize]) -> isize { x.sum_() }
pub fn main() {
let x = vec![1, 2, 3];
let y = call_sum(&x);
println!("y=={}", y);
assert_eq!(y, 6);
let x = vec![1, 2, 3];
let y = x.sum_();
println!("y=={}", y);
assert_eq!(y, 6);
let x = vec![1, 2, 3];
let y = x.sum_();
println!("y=={}", y);
assert_eq!(y, 6);
}
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