code: function assertReservedSlotInitialized(slotOffset, numSlots) {
      if (firstTemplatePass) {
          var startIndex = tView.bindingStartIndex - slotOffset;
          for (var i = 0; i < numSlots; i++) {
              assertEqual(viewData[startIndex + i], NO_CHANGE, 'The reserved slots should be set to `NO_CHANGE` on first template pass');
          }
      }
  }
docs: On the first template pass, the reserved slots should be set `NO_CHANGE`.
  
  If not, they might not have been actually reserved.