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//go:generate re2go $INPUT -o $OUTPUT -i package main func lex(str string) { var cursor int /*!re2c re2c:define:YYCTYPE = byte; re2c:define:YYPEEK = "str[cursor]"; re2c:define:YYSKIP = "cursor += 1"; re2c:yyfill:enable = 0; number = [1-9][0-9]*; number { return } * { panic("error!") } */ } func main() { lex("1234\x00") }