# File lib/treetop/compiler/node_classes/parsing_rule.rb, line 34
      def generate_cache_lookup(builder)
        builder.if_ "node_cache[:#{name}].has_key?(index)" do
          builder.assign 'cached', "node_cache[:#{name}][index]"
          builder.if_ "cached" do
            builder << 'cached = SyntaxNode.new(input, index...(index + 1)) if cached == true'
            builder << '@index = cached.interval.end'
          end
          builder << 'return cached'
        end
      end