Function copy_from_self

cranelift/entity/src/list.rs:931–955

()

    #[test]
    #[should_panic]
    fn copy_from_self() {
        let pool = &mut ListPool::<Inst>::new();

        let i1 = Inst::new(1);
        let i2 = Inst::new(2);
        let i3 = Inst::new(3);
        let i4 = Inst::new(4);

        let mut list = EntityList::from_slice(&[i4, i3, i2, i1, i1, i2, i3, i4], pool);
        let list_again = list;
        assert_eq!(list.as_slice(pool), &[i4, i3, i2, i1, i1, i2, i3, i4]);
        // Panic should occur on the line below because `list.index == other.index`
        list.copy_from(&list_again, 0..=1, 8, pool);
        assert_eq!(
            list.as_slice(pool),
            &[i4, i3, i2, i1, i1, i2, i3, i4, i4, i3]
        );
        list.copy_from(&list_again, .., 7, pool);
        assert_eq!(
            list.as_slice(pool),
            &[
                i4, i3, i2, i1, i1, i2, i4, i3, i2, i1, i1, i2, i3, i4, i4, i3, i3, i4, i4, i3
            ]
        )
    }
}