rust/src/test/ui/union/union-borrow-move-parent-sibling.rs

#![feature(untagged_unions)]
#![allow(unused)]

#[allow(unions_with_drop_fields)]
union U {
    x: ((Vec<u8>, Vec<u8>), Vec<u8>),
    y: Box<Vec<u8>>,
}

fn use_borrow<T>(_: &T) {}

unsafe fn parent_sibling_borrow() {
    let mut u = U { x: ((Vec::new(), Vec::new()), Vec::new()) };
    let a = &mut u.x.0;
    let b = &u.y; //~ ERROR cannot borrow `u.y`
    use_borrow(a);
}

unsafe fn parent_sibling_move() {
    let u = U { x: ((Vec::new(), Vec::new()), Vec::new()) };
    let a = u.x.0;
    let b = u.y; //~ ERROR use of moved value: `u.y`
}

unsafe fn grandparent_sibling_borrow() {
    let mut u = U { x: ((Vec::new(), Vec::new()), Vec::new()) };
    let a = &mut (u.x.0).0;
    let b = &u.y; //~ ERROR cannot borrow `u.y`
    use_borrow(a);
}

unsafe fn grandparent_sibling_move() {
    let u = U { x: ((Vec::new(), Vec::new()), Vec::new()) };
    let a = (u.x.0).0;
    let b = u.y; //~ ERROR use of moved value: `u.y`
}

unsafe fn deref_sibling_borrow() {
    let mut u = U { y: Box::default() };
    let a = &mut *u.y;
    let b = &u.x; //~ ERROR cannot borrow `u` (via `u.x`)
    use_borrow(a);
}

unsafe fn deref_sibling_move() {
    let u = U { x: ((Vec::new(), Vec::new()), Vec::new()) };
    let a = *u.y;
    let b = u.x; //~ ERROR use of moved value: `u.x`
}


fn main() {}