d的嵌套指派

theFirstName[theFirstIndex].theSecondName[theSecondIndex].thirdName[theThirdIndex]=x;
//你想改寫為如下:
alias shortName = theFirstName[theFirstIndex].theSecondName[theSecondIndex].thirdName[theThirdIndex];
shortName = x;      

ref shortName() {
    return theFirstName[theFirstIndex].theSecondName[theSecondIndex].thirdName[theThirdIndex];
  }

shortName = x;