Iso8601.Iso8601.per.valid2: def of bend-time-lib@0.4.0.1
Import: import bend-time-lib@0.4.0.1/iso8601.bend as Iso8601
Lines 562-569 of bend-time-lib@0.4.0.1/iso8601.bend: https://jend.leeeet.dev/read.txt?path=bend-time-lib@0.4.0.1/iso8601.bend&start_line=562&end_line=569

import Base
import bend-time-lib@0.4.0.1/period.bend as Per

def Iso8601.per.valid2(
  y: U32, m: U32, d: U32, ok: Bool
) -> Result<&2, &2, Iso8601.Error, Per.Period>:
  match ok:
    case False{}:
      Fail{Invalid{}}
    case True{}:
      Iso8601.per.mk2(Per.Period.from(y, m, d))

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-time-lib@0.4.0.1/iso8601.bend&name=Iso8601.Error
  https://jend.leeeet.dev/definition.txt?path=bend-time-lib@0.4.0.1/iso8601.bend&name=Iso8601.per.mk2
  https://jend.leeeet.dev/definition.txt?path=bend-time-lib@0.4.0.1/period.bend&name=Period
  https://jend.leeeet.dev/definition.txt?path=bend-time-lib@0.4.0.1/period.bend&name=Period.from