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On Mar 2, 2012, at 6:44 AM, Tony Finch wrote: > Axel Kittenberger <axkibe@gmail.com> wrote: >> >> I cannot make any circles with immutables! > > You can, for example in ML, > > val rec xs = 1 :: xs With lazy languages, you can make more complex circular structures. http://www.haskell.org/haskellwiki/Tying_the_Knot e