def Date.sub_ov
import bend-time-lib@0.4.0.1/date.bend as Dateimport Base
380def Date.sub_ov(+z: U32, n: U32, ok: Bool) -> Result<&2, &2, Date.Error, Date>:
381 match ok:
382 case False{}:
383 Fail{OutOfRange{}}
384 case True{}:
385 Date.from_days(U32.sub(z, n))