--- Comment #7 from Steven Schveighoffer <> 2010-07-22 
10:46:24 PDT ---
You might misunderstand what I was talking about.

I meant that specific example of a workaround won't work, not that you couldn't
implement takeBack.

As far as I know, the only restriction would be that the input would need to be
a random access range, so you could get the $-Nth element in O(1) time.

I'd probably call it something different however, like takeTail (or just tail),
since back implies you only want the back element, or are starting with the
back element.

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