There is also the issue that they may not know that the thing isn't "taught" yet because they don't know its a "thing". I once got points taken off for using a

There is also the issue that they may not know that the thing isn't "taught" yet because they don't know its a "thing". I once got points taken off for using a recursive function as part of my solution. I didn't know the language before, nor did I have much experience with recursive functions as a formal concept. I didn't even know at that time that recursive functions were a special thing that had to be taught to me.