func badFormatAt(info *types.Info, e ast.Expr) int {
	tv, ok := info.Types[e]
	if !ok { // no type info, assume good
		return -1
	}

	t, ok := tv.Type.(*types.Basic) // sic, no unalias
	if !ok || t.Info()&types.IsString == 0 {
		return -1
	}

	if tv.Value == nil {
		return -1
	}

	return strings.Index(constant.StringVal(tv.Value), badFormat)

}

func (s *ss) notEOF() {
	// Guarantee there is data to be read.
	if r := s.getRune(); r == eof {
		panic(io.EOF)
	}
	s.UnreadRune()
}

// accept checks the next rune in the input. If it's a byte (sic) in the string, it puts it in the
// buffer and returns true. Otherwise it return false.
func (s *ss) accept(ok string) bool {
	return s.consume(ok, true)
}

		$2 !~ /^RTC_VL_(ACCURACY|BACKUP|DATA)/ &&
		$2 ~ /^(NETLINK|NLM|NLMSG|NLA|IFA|IFAN|RT|RTC|RTCF|RTN|RTPROT|RTNH|ARPHRD|ETH_P|NETNSA)_/ ||
		$2 ~ /^SOCK_|SK_DIAG_|SKNLGRP_$/ ||
		$2 ~ /^FIORDCHK$/ ||
		$2 ~ /^SIOC/ ||
		$2 ~ /^TIOC/ ||
		$2 ~ /^TCGET/ ||
		$2 ~ /^TCSET/ ||
		$2 ~ /^TC(FLSH|SBRKP?|XONC)$/ ||
		$2 !~ "RTF_BITS" &&
		$2 ~ /^(IFF|IFT|NET_RT|RTM(GRP)?|RTF|RTV|RTA|RTAX)_/ ||
		$2 ~ /^BIOC/ ||

			// we run the helper, but if we lose that race once in a while it's okay: the
			// select will just proceed immediately. Not a big deal.
			// For short tests we can grow [sic] the timeout a bit without fear of taking too long
			pause := 10 * time.Microsecond
			if testing.Short() {
				pause = 100 * time.Microsecond
			}
			time.AfterFunc(pause, helper)
		}