# File lib/treetop/runtime/compiled_parser.rb, line 104
      def terminal_parse_failure(expected_string)
        return nil if index < max_terminal_failure_index
        if index > max_terminal_failure_index
          @max_terminal_failure_index = index
          @terminal_failures = []
        end
        @terminal_failures << [index, expected_string]
        return nil
      end