diff options
| -rw-r--r-- | library/alloc/src/str.rs | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/library/alloc/src/str.rs b/library/alloc/src/str.rs index a7584c6b651..4d1e876457b 100644 --- a/library/alloc/src/str.rs +++ b/library/alloc/src/str.rs @@ -163,7 +163,7 @@ where }) .expect("attempt to join into collection with len > usize::MAX"); - // crucial for safety + // prepare an uninitialized buffer let mut result = Vec::with_capacity(reserved_len); debug_assert!(result.capacity() >= reserved_len); @@ -178,9 +178,9 @@ where // massive improvements possible (~ x2) let remain = specialize_for_lengths!(sep, target, iter; 0, 1, 2, 3, 4); - // issue #80335: A weird borrow implementation can return different - // slices for the length calculation and the actual copy, so - // `remain.len()` might be non-zero. + // A weird borrow implementation may return different + // slices for the length calculation and the actual copy. + // Make sure we don't expose uninitialized bytes to the caller. let result_len = reserved_len - remain.len(); result.set_len(result_len); } |