# File lib/treetop/compiler/node_classes/character_class.rb, line 4
      def compile(address, builder, parent_expression = nil)
        super

        builder.if__ "has_terminal?(@regexps[gr = #{grounded_regexp(text_value)}] ||= Regexp.new(gr), :regexp, index)" do
          if address == 0 || decorated?
            assign_result "instantiate_node(#{node_class_name},input, index...(index + 1))"
            extend_result_with_inline_module parent_expression
          else
            assign_lazily_instantiated_node
          end
          builder << "@index += 1"  # Always one character
        end
        builder.else_ do
          builder << "terminal_parse_failure(#{expected})"
          assign_result 'nil'
        end
      end