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// run-pass fn reverse(v: &mut [usize]) { v.reverse(); } fn bar(v: &mut [usize]) { reverse(v); reverse(v); reverse(v); } pub fn main() { let mut the_vec = vec![1, 2, 3, 100]; bar(&mut the_vec); assert_eq!(the_vec, [100, 3, 2, 1]); }