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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/nll/issue-62007-assign-const-index.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/nll/issue-62007-assign-const-index.rs')
-rw-r--r-- | src/test/ui/nll/issue-62007-assign-const-index.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/nll/issue-62007-assign-const-index.rs b/src/test/ui/nll/issue-62007-assign-const-index.rs new file mode 100644 index 000000000..3ea5d3a7a --- /dev/null +++ b/src/test/ui/nll/issue-62007-assign-const-index.rs @@ -0,0 +1,32 @@ +// Issue #62007: assigning over a const-index projection of an array +// (in this case, `list[I] = n;`) should in theory be able to kill all borrows +// of `list[0]`, so that `list[0]` could be borrowed on the next +// iteration through the loop. +// +// Currently the compiler does not allow this. We may want to consider +// loosening that restriction in the future. (However, doing so would +// at *least* require T-lang team approval, and probably an RFC; e.g. +// such loosening might make complicate the user's mental mode; it +// also would make code more brittle in the face of refactorings that +// replace constants with variables. + +#![allow(dead_code)] + +struct List<T> { + value: T, + next: Option<Box<List<T>>>, +} + +fn to_refs<T>(mut list: [&mut List<T>; 2]) -> Vec<&mut T> { + let mut result = vec![]; + loop { + result.push(&mut list[0].value); //~ ERROR cannot borrow `list[_].value` as mutable + if let Some(n) = list[0].next.as_mut() { //~ ERROR cannot borrow `list[_].next` as mutable + list[0] = n; + } else { + return result; + } + } +} + +fn main() {} |