def obs_unit
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
485def obs_unit(r: Bitset & Result<&2, &2, E.Error, Unit>) -> Bitset & E.Obs:
486 (s, x) = r
487 (s, E.OUnit{x})