def step_acc_at
import bend-collections@1.0.0.0/src/containers/dynamic_array.bend as DynamicArrayimport Base
import bend-collections@1.0.0.0/src/containers/types/dynamic_array.bend as E
481def step_acc_at(~T: Data, op: E.Op<T>, st: DynArray<&2, T> & List<&2, E.Obs<T>>) -> DynArray<&2, T> & List<&2, E.Obs<T>>:
482 (da, acc) = st
483 record(T, acc, step_at(~T, da, op))