EmergingEztoml.wf.date: def of emerging-eztoml@0.9.0.0
Import: import emerging-eztoml@0.9.0.0/main.bend as EmergingEztoml
Lines 6220-6223 of emerging-eztoml@0.9.0.0/main.bend: https://jend.leeeet.dev/read.txt?path=emerging-eztoml@0.9.0.0/main.bend&start_line=6220&end_line=6223

import Base

# a date: a four-digit year, a month, and a day within that month in that year
def wf.date(dd: Date) -> Bool:
  Date{+y, +mo, +day} = dd
  Bool.and(U32.is_le(y, 9999), Bool.and(bound.rng(mo, 1, 12), bound.rng(day, 1, when.days(y, mo))))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_le
  https://jend.leeeet.dev/definition.txt?path=emerging-eztoml@0.9.0.0/main.bend&name=Date
  https://jend.leeeet.dev/definition.txt?path=emerging-eztoml@0.9.0.0/main.bend&name=bound.rng
  https://jend.leeeet.dev/definition.txt?path=emerging-eztoml@0.9.0.0/main.bend&name=when.days