re      *regexp.Regexp
	lineNum int
	auto    bool // match <autogenerated> line
	file    string
	prefix  string
}

var (
	errRx       = regexp.MustCompile(`// (?:GC_)?ERROR (.*)`)
	errAutoRx   = regexp.MustCompile(`// (?:GC_)?ERRORAUTO (.*)`)
	errQuotesRx = regexp.MustCompile(`"([^"]*)"`)
	lineRx      = regexp.MustCompile(`LINE(([+-])(\d+))?`)
)