def successor_ready
import bend-collections@1.0.0.0/src/containers/balanced_search_tree.bend as BalancedSearchTreeimport Base
1397def successor_ready(~K: Data, ~V: Data, ~cmp: K -> K -> Cmp, +target: Nat, r: TreeMap<K, V, cmp> & Nat) -> TreeMap<K, V, cmp> & Nat:
1398 (m, source) = r
1399 move_successor(~K, ~V, ~cmp, m, target, source)