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https://github.com/rust-lang/rust
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36 lines
600 B
Rust
36 lines
600 B
Rust
//@ run-pass
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// Test that a custom deref with a fat pointer return type does not ICE
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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_eq!(x[0], 1);
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assert_eq!(x[1], 2);
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assert_eq!(x[2], 3);
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}
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fn main() {
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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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