bors f68e08933d Auto merge of #76929 - ssomers:btree_cleanup_2, r=Mark-Simulacrum
BTreeMap: wrap node's raw parent pointer in NonNull

Now that the other `*const` (root) is gone, seemed like a small step forward.

r? `@Mark-Simulacrum`
2020-09-19 19:15:06 +00:00
..