def step_acc
import bend-collections@1.0.0.0/src/containers/binary_heap.bend as BinaryHeapimport Base
import bend-collections@1.0.0.0/src/containers/types/binary_heap.bend as E
418def step_acc(~A: Data, ~cmp: A -> A -> Cmp, op: E.Op<A>, st: Heap<A> & List<&2, E.Obs<A>>) -> Heap<A> & List<&2, E.Obs<A>>:
419 (h, acc) = st
420 record(~A, acc, step(~A, ~cmp, h, op))