A user posted a question asking, "What does this code do?" (along with a code snippet). There was nothing in the question to indicate that the user did any research or otherwise exerted any degree of effort in understanding the code.
What reason should I select for my close vote?
If the question is barely more than 'What does this code do?' with a dump of an entire program, then they are essentially expecting answerers to go though the program line-by-line and explain what each does. That is asking too many questions at once, so I would vote to close as 'Needs more focus.' The question would be better off explaining attempts to find out what the code does to narrow down on the parts they do not understand, and/or split up into multiple questions about multiple parts they do not understand.
However, if a question is asking about one particular statement or construct or maybe even a function with a specific purpose, and elaborates that they are not familiar with a specific syntax used for example, or how specific hard-to-read computation would play out, the question would be reasonably scoped and should be left open. This example is a well-scoped question because they are asking about a specific macro with a specific purpose, that can be explained in a reasonably-scoped answer.
:-!! construct.