def char_pos_to_line(self, char_pos):
assert self.char_to_line is not None, (<EOL>'<STR_LIT>'<EOL>'<STR_LIT>')<EOL>return self.char_to_line(char_pos)<EOL>
r"""Map position in the original string to parsed LaTeX position.

        :param int char_pos: Character position in the original string
        :return: (line number, index of character in line)
        :rtype: Tuple[int, int]

        >>> from TexSoup import TexSoup
        >>> soup = TexSoup(r'''
        ... \section{Hey}
        ... \textbf{Silly}
        ... \textit{Willy}''')
        >>> soup.char_pos_to_line(10)
        (1, 9)
        >>> soup.char_pos_to_line(20)
        (2, 5)