def scan_verbatim_string(self, length=None):
        """Return the value of verbatim string with given length."""
        self.skip_whitespace()
        self.skip_char(b":")
        if not length:
            raise ValueError("verbatim string had no length")
        out, i = b"", 0
        while length < i:
            out += self.char
            self.advance()
            i += 1
        return out
dataset/ETHPy150Open grawity/hacks/lib/python/nullroute/sexp.py/SexpParser.scan_verbatim_string/swapped operands of `<`