def root_id
import bend-collections@1.0.0.0/src/containers/balanced_search_tree.bend as BalancedSearchTreeimport Base
228def root_id(~K: Data, ~V: Data, ~cmp: K -> K -> Cmp, m: TreeMap<K, V, cmp>) -> TreeMap<K, V, cmp> & Nat:
229 TM{n, +root, lo, hi, free, nodes, payloads} = m
230 (TM{n, root, lo, hi, free, nodes, payloads}, root)