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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 | ||
1a4d82fc JJ |
13 | |
14 | use std::ops::{Deref, DerefMut}; | |
15 | ||
16 | pub struct Arr { | |
c34b1796 | 17 | ptr: Box<[usize]> |
1a4d82fc JJ |
18 | } |
19 | ||
20 | impl Deref for Arr { | |
c34b1796 | 21 | type Target = [usize]; |
1a4d82fc | 22 | |
c34b1796 | 23 | fn deref(&self) -> &[usize] { |
1a4d82fc JJ |
24 | panic!(); |
25 | } | |
26 | } | |
27 | ||
28 | impl DerefMut for Arr { | |
c34b1796 | 29 | fn deref_mut(&mut self) -> &mut [usize] { |
1a4d82fc JJ |
30 | &mut *self.ptr |
31 | } | |
32 | } | |
33 | ||
34 | pub fn foo(arr: &mut Arr) { | |
c34b1796 | 35 | let x: &mut [usize] = &mut **arr; |
62682a34 SL |
36 | assert_eq!(x[0], 1); |
37 | assert_eq!(x[1], 2); | |
38 | assert_eq!(x[2], 3); | |
1a4d82fc JJ |
39 | } |
40 | ||
41 | fn main() { | |
c34b1796 AL |
42 | // FIXME (#22405): Replace `Box::new` with `box` here when/if possible. |
43 | let mut a = Arr { ptr: Box::new([1, 2, 3]) }; | |
1a4d82fc JJ |
44 | foo(&mut a); |
45 | } |