# File lib/sprockets/index.rb, line 80
      def build_asset(path, pathname, options)
        # Memory cache
        key = cache_key_for(pathname, options)
        if @assets.key?(key)
          @assets[key]
        else
          @assets[key] = begin
            # Persisted cache
            cache_asset(key) do
              super
            end
          end
        end
      end