def fill
import bend-collections@1.0.0.0/src/containers/bitset.bend as Bitsetimport Base
437def fill(bs: List<&2, Bool>, +i: Nat, s: Bitset) -> Bitset:
438 match bs:
439 case Nil{}:
440 s
441 case Con{b, t}:
442 fill(t, 1n+i, fill_pick(b, s, i))