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    Date: Sun ,22 Jun 80 18:14:00 EDT
    From: johan at MIT-AI (Johan de Kleer)
    To: (BUG LISPM) at MIT-AI

    In system 29.95 NWS, with microcode 669, on LISP Machine Two:

    (defun foo nil
      (condition-bind ((nil (throw nil nil)))

    Compile it and then type (foo) and you will get an ILLOP at PC 20212.
    I tried this on two machines, and both do the same thing.

T and NIL are not valid tag arguments to throw.  I will investigate
why you get an illop rather than a trap.