code: def t_singlecomment_NEWLINE(self, t):
          r'\r?\n'
          t.lexer.pop_state()  # Back to initial
          t.lexer.lineno += 1
          return f t_singlecomment_NEWLINE(self, t):
          r'\r?\n'
          t.lexer.pop_state()  # Back to initial
          t.lexer.lineno += 1
          return t
docs: r'\r?\n