diff options
Diffstat (limited to 'src/test/ui/borrowck/issue-62007-assign-box.rs')
-rw-r--r-- | src/test/ui/borrowck/issue-62007-assign-box.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/issue-62007-assign-box.rs b/src/test/ui/borrowck/issue-62007-assign-box.rs new file mode 100644 index 000000000..f6fbea821 --- /dev/null +++ b/src/test/ui/borrowck/issue-62007-assign-box.rs @@ -0,0 +1,27 @@ +// run-pass + +// Issue #62007: assigning over a deref projection of a box (in this +// case, `*list = n;`) should be able to kill all borrows of `*list`, +// so that `*list` can be borrowed on the next iteration through the +// loop. + +#![allow(dead_code)] + +struct List<T> { + value: T, + next: Option<Box<List<T>>>, +} + +fn to_refs<T>(mut list: Box<&mut List<T>>) -> Vec<&mut T> { + let mut result = vec![]; + loop { + result.push(&mut list.value); + if let Some(n) = list.next.as_mut() { + *list = n; + } else { + return result; + } + } +} + +fn main() {} |