BTreeMap: replace Root with NodeRef<Owned, ...>#78104

Merged

bors merged 1 commit intorust-lang:masterfrom ssomers:btree_root_redux

Nov 20, 2020

+168-176

Commits on Nov 18, 2020

BTreeMap: reuse NodeRef as Root, keep BoxedNode for edges only, ban Unique
ssomers
committed