def count_in
import near-architecture@0.9.1.0/arc.bend as Arcimport Base
532def count_in(+want: Cap, cs: List<&2, Cap>) -> Nat:
533 match cs:
534 case []:
535 0n
536 case c <> rest:
537 Nat.add(one_if(is_cap(want, c)), count_in(want, rest))