//@ run-pass
fn want_slice(v: &[isize]) -> isize {
let mut sum = 0;
for i in v { sum += *i; }
sum
}
fn has_mut_vec(v: Vec<isize> ) -> isize {
want_slice(&v)
pub fn main() {
assert_eq!(has_mut_vec(vec![1, 2, 3]), 6);