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Tail Recursion in Common Lisp ???

    ok, ok, my question was sloppily worded.  does the definition of Common
    Lisp require that all implementations have tail recursion optimization ?

No.  It has even been suggested that the current definition does not 
allow tail-recursion optimization -- that's an issue we have to settle
soon, and I hope that we'll be able to work out a solution in which this
is allowed.

-- Scott