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Re: exitlist in new-style DO

I don't really like arguments of the form "X should not be done because it
is a pain to implement".  Even worse are arguments "X should not be done
because it requires a [totally trivial] amount of extra code/memory."  Having
COND work the way it does is conceptually natural and elegant.  I think DO
should be adjusted similarly.

On the other hand, if the change really would break tons of code, then I
won't press it.  How many routines actually depend on DO returning NIL
when there is no exitlist?

-- Dave