    # File lib/facets/more/buildingblock.rb, line 120
      def method_missing(s, *a, &b)
        s = s.to_s

        if b
          @stack << @out
          @out = ''
          @instance_eval.call(&b)
          out = @out
          @out = @stack.pop
          a.unshift(out)
        end

        if s =~ /^call_/
          m = s[5..-1].to_sym
          @module.send(m, *a, &b).to_s
        elsif @module.respond_to?(s) #o =~ /^build_/
          @out << @module.send(s, *a, &b).to_s
        else
          s = s.chomp('?') if s[-1,1] == '?'
          @out << @module.send(@constructor, s, *a).to_s
        end
      end