no strict 'refs';
for($cgi->param) {
  ## &func is bad form, see. perlsub
  complain()
    unless exists  ${__PACKAGE__."::"}{$_}
       and defined *{ ${__PACKAGE__."::"}{$_} }{SCALAR}
       and defined ${ *{ ${__PACKAGE__."::"}{$_} }{SCALAR} };
}