1 // revisions: mirunsafeck thirunsafeck
2 // [thirunsafeck]compile-flags: -Z thir-unsafeck
4 #![feature(untagged_unions)]
7 use std::ops::{Deref, DerefMut};
15 fn new(value: T) -> Self { MockBox { value: [value] } }
18 impl<T> Deref for MockBox<T> {
20 fn deref(&self) -> &T { &self.value[0] }
23 impl<T> DerefMut for MockBox<T> {
24 fn deref_mut(&mut self) -> &mut T { &mut self.value[0] }
33 fn new() -> Self { MockVec { value: [] } }
36 impl<T> Deref for MockVec<T> {
38 fn deref(&self) -> &[T] { &self.value }
41 impl<T> DerefMut for MockVec<T> {
42 fn deref_mut(&mut self) -> &mut [T] { &mut self.value }
47 x: ((MockVec<u8>, MockVec<u8>), MockVec<u8>),
48 y: MockBox<MockVec<u8>>,
51 fn use_borrow<T>(_: &T) {}
53 unsafe fn parent_sibling_borrow() {
54 let mut u = U { x: ((MockVec::new(), MockVec::new()), MockVec::new()) };
56 let b = &u.y; //~ ERROR cannot borrow `u` (via `u.y`)
60 unsafe fn parent_sibling_move() {
61 let u = U { x: ((MockVec::new(), MockVec::new()), MockVec::new()) };
63 let b = u.y; //~ ERROR use of moved value: `u`
66 unsafe fn grandparent_sibling_borrow() {
67 let mut u = U { x: ((MockVec::new(), MockVec::new()), MockVec::new()) };
68 let a = &mut (u.x.0).0;
69 let b = &u.y; //~ ERROR cannot borrow `u` (via `u.y`)
73 unsafe fn grandparent_sibling_move() {
74 let u = U { x: ((MockVec::new(), MockVec::new()), MockVec::new()) };
76 let b = u.y; //~ ERROR use of moved value: `u`
79 unsafe fn deref_sibling_borrow() {
80 let mut u = U { y: MockBox::default() };
82 let b = &u.x; //~ ERROR cannot borrow `u` (via `u.x`)
86 unsafe fn deref_sibling_move() {
87 let u = U { x: ((MockVec::new(), MockVec::new()), MockVec::new()) };
88 // No way to test deref-move without Box in union
90 // let b = u.x; ERROR use of moved value: `u`