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// 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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