]>
Commit | Line | Data |
---|---|---|
1a4d82fc JJ |
1 | // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | // Test that a custom deref with a fat pointer return type does not ICE | |
12 | ||
c34b1796 | 13 | // pretty-expanded FIXME #23616 |
1a4d82fc JJ |
14 | |
15 | use std::ops::{Deref, DerefMut}; | |
16 | ||
17 | pub struct Arr { | |
c34b1796 | 18 | ptr: Box<[usize]> |
1a4d82fc JJ |
19 | } |
20 | ||
21 | impl Deref for Arr { | |
c34b1796 | 22 | type Target = [usize]; |
1a4d82fc | 23 | |
c34b1796 | 24 | fn deref(&self) -> &[usize] { |
1a4d82fc JJ |
25 | panic!(); |
26 | } | |
27 | } | |
28 | ||
29 | impl DerefMut for Arr { | |
c34b1796 | 30 | fn deref_mut(&mut self) -> &mut [usize] { |
1a4d82fc JJ |
31 | &mut *self.ptr |
32 | } | |
33 | } | |
34 | ||
35 | pub fn foo(arr: &mut Arr) { | |
c34b1796 | 36 | let x: &mut [usize] = &mut **arr; |
1a4d82fc JJ |
37 | assert!(x[0] == 1); |
38 | assert!(x[1] == 2); | |
39 | assert!(x[2] == 3); | |
40 | } | |
41 | ||
42 | fn main() { | |
c34b1796 AL |
43 | // FIXME (#22405): Replace `Box::new` with `box` here when/if possible. |
44 | let mut a = Arr { ptr: Box::new([1, 2, 3]) }; | |
1a4d82fc JJ |
45 | foo(&mut a); |
46 | } |