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If it means people posting their random code and asking others to debug it disappears from stackoverflow I'm all for it.

While their at it it would be nice if questions marked as duplicate were either deleted or at least had a pointer to the duplicate

Uh, duplicates always have the question that they are a duplicate of linked - http://i.imgur.com/1lata16.png. In fact, if you don't see this it's probably a bug and you should report it http://meta.stackoverflow.com/questions/ask?tags=bug