Dns.ipv6.ch: def of bend-kit-dns@0.7.0.0
Import: import bend-kit-dns@0.7.0.0/dns.bend as Dns
Lines 407-412 of bend-kit-dns@0.7.0.0/dns.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-dns@0.7.0.0/dns.bend&start_line=407&end_line=412

import Base

def ipv6.ch(+c: U32) -> Bool:
  Bool.or(
    Bool.and(U32.is_le(48, c), U32.is_le(c, 57)),
    Bool.or(
      Bool.and(U32.is_le(97, c), U32.is_le(c, 102)),
      Bool.and(U32.is_le(65, c), U32.is_le(c, 70))))

Uses (5):
  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=Bool.or
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_le