Sometimes overly brief answers will be tagged with a generic message about how they shouldn't be too brief with mostly code as they may not be considered answers in that state.
Here's the message:
We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.
However, this can apparently appear on questions, too:
For a start, it says 'answers' rather than posts, but also it's not quite the message that fits questions anyway, even if questions are intended to be tagged with such a message. It should either be reworded for questions or prevented from appearing on questions. Brief code-heavy questions are a different problem to such answers (if they're even seen as a problem, that is).