def record
import bend-collections@1.0.0.0/src/containers/stack.bend as Stackimport Base
import bend-collections@1.0.0.0/src/containers/types/stack.bend as E
65def record(~T: Data, acc: List<&2, E.Obs<T>>, r: Stack<T> & E.Obs<T>) -> Stack<T> & List<&2, E.Obs<T>>:
66 (q, o) = r
67 (q, Con{o, acc})