Raised when trying to parse a domain which is formally defined by a rule, but the rules set a requirement which is not satisfied by the input you are trying to parse.

@example

  PublicSuffix.parse("nic.do")
  # => PublicSuffix::DomainNotAllowed

  PublicSuffix.parse("www.nic.do")
  # => PublicSuffix::Domain

@since 0.6.0