def step_acc
import bend-collections@1.0.0.0/src/containers/bitset.bend as Bitsetimport Base
import bend-collections@1.0.0.0/src/containers/types/bitset.bend as E
540def step_acc(op: E.Op, st: Bitset & List<&2, E.Obs>) -> Bitset & List<&2, E.Obs>:
541 (s, acc) = st
542 record(acc, step(s, op))