#![allow(unused_variables)]
fn main() {
    let mut v = Vec::with_capacity(10);
    let uninit = v.spare_capacity_mut();
    uninit[0].write(0);
    uninit[1].write(1);
    uninit[2].write(2);
    unsafe {
        v.set_len(3);
    }
    assert_eq!(& v, & [0, 1, 2]);
}