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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/dynamically-sized-types/dst-deref-mut.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/dynamically-sized-types/dst-deref-mut.rs')
-rw-r--r-- | src/test/ui/dynamically-sized-types/dst-deref-mut.rs | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/dynamically-sized-types/dst-deref-mut.rs b/src/test/ui/dynamically-sized-types/dst-deref-mut.rs new file mode 100644 index 000000000..1d62f42bd --- /dev/null +++ b/src/test/ui/dynamically-sized-types/dst-deref-mut.rs @@ -0,0 +1,35 @@ +// run-pass +// Test that a custom deref with a fat pointer return type does not ICE + + +use std::ops::{Deref, DerefMut}; + +pub struct Arr { + ptr: Box<[usize]> +} + +impl Deref for Arr { + type Target = [usize]; + + fn deref(&self) -> &[usize] { + panic!(); + } +} + +impl DerefMut for Arr { + fn deref_mut(&mut self) -> &mut [usize] { + &mut *self.ptr + } +} + +pub fn foo(arr: &mut Arr) { + let x: &mut [usize] = &mut **arr; + assert_eq!(x[0], 1); + assert_eq!(x[1], 2); + assert_eq!(x[2], 3); +} + +fn main() { + let mut a = Arr { ptr: Box::new([1, 2, 3]) }; + foo(&mut a); +} |