Before the changes to "close vote" options, we used to have "not constructive," which I think would cover this case.
What option should we use now when a question includes a piece of code and asks for a specific explanation of how it works? There doesn't seem to be an appropriate option for closing such a question. Are these kinds of questions perhaps acceptable now?
The question I just looked at that led me to wonder this is How can functions be called as an argument for a function?
The problem that I personally have with this question is that it is not very helpful for other visitors (which is something we used to care about): nobody else will have that exact same code, and with such a poor title and description it would be unlikely anyone would stumble across this post while searching for a valid answer to their problem.