What's the best way to write a lazy list data type in ocaml?  I've been
playing around with this datatype (from an old mailing list posting):

type 'a stream =
  Nil
| Cons of 'a Lazy.t * 'a stream Lazy.t

but I can't figure out how to write a "stream_cons" function.  Also, it
appears that the Lazy.t data type uses references; why is this?

Mike
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