Dns.ipv4: def of bend-kit-dns@0.7.0.0
Import: import bend-kit-dns@0.7.0.0/dns.bend as Dns
Lines 403-405 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=403&end_line=405

import Base

# Digits and dots; TCP.connect rejects anything else that is not an address.
def ipv4(+s: String) -> Bool:
  Bool.and(Bool.not(String.is_empty(s)), ipv4.go(s))

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=Bool.not
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.is_empty
  https://jend.leeeet.dev/definition.txt?path=bend-kit-dns@0.7.0.0/dns.bend&name=ipv4.go