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Re: Happy Flag Day

Return-path: <Moon@SCRC-TENEX>
Received: from SCRC-SPANIEL by SCRC-TENEX with CHAOS; Wed 15-Jun-83 02:22:19-EDT
Received: from SCRC-EUPHRATES by SCRC-SPANIEL with CHAOS; Wed 15-Jun-83 02:21:52-EDT
Date: Wed, 15 Jun 1983 06:21:00 -0000
From: David A. Moon <Moon at SCRC>
Subject: Re: Happy Flag Day
To: Bernard S. Greenberg <BSG at SCRC>
Cc: Common-Lisp at SU-AI
In-reply-to: The message of 14 Jun 83 23:36-EDT from Bernard S. Greenberg <BSG%SCRC-TENEX%MIT-MC at SU-DSN>

    Date: 14 Jun 1983 2336-EDT
    From: Bernard S. Greenberg <BSG%SCRC-TENEX%MIT-MC@SU-DSN>
    Leave SUBST (historical reasons) and fix SUBSTITUTE &c.

But (p. 182) 
    SUBST new old tree &key :test :test-not :key
    SUBST-IF predicate new tree &key :key

So historical reasons make no sense.  No one proposes to make
the args to SUBST be old first then new.

I can live with whichever Guy decides to change (SUBST-IF or
SUBSTITUTE-IF) as long as he makes them consistent.
OK, I believe this.