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[no subject]

    Date: 11 NOV 1978 1259-EST
    From: JIS at MIT-MC (Jeffrey I. Schiller)

    (append '(1 . -1) '1)
    MPV; 15162>>HLRZ 1,(5)   1/   115636   777777/   ??

    need I say more?

    The interpreter should at least catch this sort of thing.
Since atom checks are soo much more expensive than NIL checks, things such
as APPEND do not check for them.  This is "well documented" and
has been flamed about before.  There are no plans to change it.