47 lines
1.1 KiB
Rust
47 lines
1.1 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Test that a custom deref with a fat pointer return type does not ICE
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// pretty-expanded FIXME #23616
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use std::ops::{Deref, DerefMut};
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pub struct Arr {
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ptr: Box<[usize]>
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}
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impl Deref for Arr {
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type Target = [usize];
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fn deref(&self) -> &[usize] {
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panic!();
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}
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}
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impl DerefMut for Arr {
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fn deref_mut(&mut self) -> &mut [usize] {
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&mut *self.ptr
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}
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}
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pub fn foo(arr: &mut Arr) {
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let x: &mut [usize] = &mut **arr;
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assert!(x[0] == 1);
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assert!(x[1] == 2);
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assert!(x[2] == 3);
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}
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fn main() {
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// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
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let mut a = Arr { ptr: Box::new([1, 2, 3]) };
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foo(&mut a);
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}
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