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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/borrowck/borrowck-overloaded-index-and-overloaded-deref.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/borrowck/borrowck-overloaded-index-and-overloaded-deref.rs')
-rw-r--r-- | tests/ui/borrowck/borrowck-overloaded-index-and-overloaded-deref.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-overloaded-index-and-overloaded-deref.rs b/tests/ui/borrowck/borrowck-overloaded-index-and-overloaded-deref.rs new file mode 100644 index 000000000..0e3e01a93 --- /dev/null +++ b/tests/ui/borrowck/borrowck-overloaded-index-and-overloaded-deref.rs @@ -0,0 +1,36 @@ +// Check that we properly record borrows when we are doing an +// overloaded, autoderef of a value obtained via an overloaded index +// operator. The accounting of the all the implicit things going on +// here is rather subtle. Issue #20232. + +use std::ops::{Deref, Index}; + +struct MyVec<T> { x: T } + +impl<T> Index<usize> for MyVec<T> { + type Output = T; + fn index(&self, _: usize) -> &T { + &self.x + } +} + +struct MyPtr<T> { x: T } + +impl<T> Deref for MyPtr<T> { + type Target = T; + fn deref(&self) -> &T { + &self.x + } +} + +struct Foo { f: usize } + +fn main() { + let mut v = MyVec { x: MyPtr { x: Foo { f: 22 } } }; + let i = &v[0].f; + v = MyVec { x: MyPtr { x: Foo { f: 23 } } }; + //~^ ERROR cannot assign to `v` because it is borrowed + read(*i); +} + +fn read(_: usize) { } |