Are there an established general guidelines on the acceptability of non-constructive, negative "you can't possibly do that" answers?

When are they allowed?

Are they disliked or frowned upon?

  • Are you talking about meta? Or some other site? Can you provide some context? Commented Dec 12, 2019 at 14:51
  • 1
    You can't do that because of ... is very constructive, I would say. Commented Dec 12, 2019 at 16:54
  • @PeterMortensen Non "constructive" answers to programming problems "how do I do such and such with only such and such tools" when it isn't doable with exactly these tools.
    – curiousguy
    Commented Dec 12, 2019 at 20:59


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