def obs_list
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
387def obs_list(~A: Data, r: Heap<A> & List<&2, A>) -> Heap<A> & E.Obs<A>:
388 (h, xs) = r
389 (h, E.OList{xs})