def Duration.sub.lt
import bend-time-lib@0.4.0.1/duration.bend as Durationimport Base
278def Duration.sub.lt(
279 a: Duration, b: Duration, lt: Bool
280) -> Result<&2, &2, Duration.Error, Duration>:
281 match lt:
282 case True{}:
283 Fail{OutOfRange{}}
284 case False{}:
285 Duration.sub.go(a, b)