def obs_bit
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
500def obs_bit(r: Bitset & Result<&2, &2, E.Error, Bool>) -> Bitset & E.Obs:
501 (s, x) = r
502 (s, E.OBit{x})