Weird bug in IF statements while using PCL

[Gregor.pa@Xerox.COM]

    Date: Tue, 2 Feb 88 17:08 EST
    From: Steve Strassmann <straz@MEDIA-LAB.MEDIA.MIT.EDU>

    In Symbolics Rel 7.1, Commonloops January 29 release:

    I know CLtL [Steele] specifies that IF forms only have 3 arguments, but
    in Symbolics rel 7.1, you may have as many ELSE clauses as you want.
    Here's a weird bug where a PCL slot is found as long as it's one of the
    first 3 arguments in an IF form, but not after that.

The next version of PCL will complain (vociferously) if you use more
than 3 arguments to if inside of a with-slot or with-accessors form.

You will have to use only three arguments to if but at least you will
get a warning when you use more than three.
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