docs: function pureFunction2(slotOffset, pureFn, exp1, exp2, thisArg) {
      ngDevMode && assertReservedSlotInitialized(slotOffset, 3);
      var index = moveBindingIndexToReservedSlot(slotOffset);
      var value = bindingUpdated2(exp1, exp2) ?
          checkAndUpdateBinding$1(thisArg ? pureFn.call(thisArg, exp1, exp2) : pureFn(exp1, exp2)) :
          consumeBinding();
      restoreBindingIndex(index);
      return value;
  }