rust/tests/ui/box/unit/unique-decl-init-copy.rs

// run-pass

pub fn main() {
    let mut i: Box<_> = Box::new(1);
    // Should be a copy
    let mut j = i.clone();
    *i = 2;
    *j = 3;
    assert_eq!(*i, 2);
    assert_eq!(*j, 3);
}