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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/closures/issue-42463.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/closures/issue-42463.rs')
-rw-r--r-- | tests/ui/closures/issue-42463.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/closures/issue-42463.rs b/tests/ui/closures/issue-42463.rs new file mode 100644 index 000000000..51d6ea3f7 --- /dev/null +++ b/tests/ui/closures/issue-42463.rs @@ -0,0 +1,32 @@ +// run-pass +use std::ops::{Deref, DerefMut}; + +struct CheckedDeref<T, F> { + value: T, + check: F +} + +impl<F: Fn(&T) -> bool, T> Deref for CheckedDeref<T, F> { + type Target = T; + fn deref(&self) -> &T { + assert!((self.check)(&self.value)); + &self.value + } +} + +impl<F: Fn(&T) -> bool, T> DerefMut for CheckedDeref<T, F> { + fn deref_mut(&mut self) -> &mut T { + assert!((self.check)(&self.value)); + &mut self.value + } +} + + +fn main() { + let mut v = CheckedDeref { + value: vec![0], + check: |v: &Vec<_>| !v.is_empty() + }; + v.push(1); + assert_eq!(*v, vec![0, 1]); +} |