Sometime if a user comments on the question, and it is good to add in our answer to make it more helpful under See Also section.
Is it good / bad to do this?
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There's nothing wrong with that, as long as you provide attribution.
What I usually do instead of doing a 1:1 copy is to add a paragraph that summarizes that the comment said, like for example
... but as @JohnDoe says in the comments, it is also possible to flabber the gargle using quorax.
thanks @usernameas a hat tip Jun 1, 2011 at 14:26
UninitializedTorikException, and the stack trace from one of those is not pretty, let me tell you.
If you use a comment or link posted from another question/comment/answer this is what I think should be done:
Simply copying it should not be to justify your comment by what's already said but to expand on the previous comment/answer.