def obs_pair_done
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
489def obs_pair_done(s: Bitset, u: Unit, x: Result<&2, &2, E.Error, Unit>) -> Bitset & E.Obs:
490 match u:
491 case Unit{}:
492 (s, E.OUnit{x})