def Date.add_ov
import bend-time-lib@0.4.0.1/date.bend as Dateimport Base
369def Date.add_ov(+z: U32, n: U32, ok: Bool) -> Result<&2, &2, Date.Error, Date>:
370 match ok:
371 case False{}:
372 Fail{OutOfRange{}}
373 case True{}:
374 Date.from_days(U32.add(z, n))