//@ run-pass fn iter_vec(v: Vec , mut f: F) where F: FnMut(&T) { for x in &v { f(x); } } pub fn main() { let v = vec![1, 2, 3, 4, 5, 6, 7]; let mut odds = 0; iter_vec(v, |i| { if *i % 2 == 1 { odds += 1; } }); println!("{}", odds); assert_eq!(odds, 4); }