<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def comment_handle(self, original, loc, tokens):
 """Store comment in comments."""

        internal_assert(len(tokens) == 1, "invalid comment tokens", tokens)
        ln = self.adjust(lineno(loc, original))
        internal_assert(lambda: ln not in self.comments, "multiple comments on line", ln)
        self.comments[ln] = tokens[0]
        return ""