Re: Multiple values

[Guy.Steele at CMU-10A]

I think that on grounds of cleanliness I too would want PROG1
to handle multiple values from its first argument.  Without that there doesn't
seem to be any simple way to get something evaluated after the
possibly-multiple-valued value-returning expression is evaluated.

On the S-1 I had planned to use a reserved register in the following way
(I think): for ordinary calls it is not used, and so they are not slowed.
A multiple-value call must push the register and then set it to 1;
on return the caller must pop it.  A callee which returns multiple
values sets the register to the number of values it is returning for
the caller to look at.  Hmm, there's a problem here.  I'll have to
look up the true solution.