diff options
Diffstat (limited to 'library/alloc/src/vec/drain.rs')
| -rw-r--r-- | library/alloc/src/vec/drain.rs | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/library/alloc/src/vec/drain.rs b/library/alloc/src/vec/drain.rs index 541f99bcf..2b1a787cc 100644 --- a/library/alloc/src/vec/drain.rs +++ b/library/alloc/src/vec/drain.rs @@ -223,9 +223,9 @@ impl<T, A: Allocator> Drop for Drain<'_, T, A> { } // as_slice() must only be called when iter.len() is > 0 because - // vec::Splice modifies vec::Drain fields and may grow the vec which would invalidate - // the iterator's internal pointers. Creating a reference to deallocated memory - // is invalid even when it is zero-length + // it also gets touched by vec::Splice which may turn it into a dangling pointer + // which would make it and the vec pointer point to different allocations which would + // lead to invalid pointer arithmetic below. let drop_ptr = iter.as_slice().as_ptr(); unsafe { |