Unnamed repository; edit this file 'description' to name the repository.
Rollup merge of #120505 - Amanieu:fix-btreemap-cursor-remove, r=m-ou-se
Fix BTreeMap's Cursor::remove_{next,prev}
These would incorrectly leave `current` as `None` after a failed attempt to remove an element (due to the cursor already being at the start/end).
