Re: Happy Flag Day

[David A. Moon <Moon at SCRC>]

    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.