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Multiple values

   Date: Tue, 29 Aug 89 19:10:26 PDT
   From: Pavel.pa@xerox.com

   -- Finally, as a side note, perhaps we could take this opportunity to
   further unspecify the returned values of SET! expressions and the various
   side-effecting primitives.  As it is, we say that they return a single
   unspecified value.  Could we go a bit further and say that they return an
   unspecified number of unspecified values?  I'd like to be able to implement
   them as returning zero values in Scheme Xerox.

I agree.  This is one of the cases that Mike and I had in mind when we
stated in our original proposal that we would need to discuss the
arity of all existing Scheme procedures. 
Morry Katz