Version 6 (not shown here) is what passed.
It was modified by amendment to strike everything in the
proposal section except for the first paragraph.
v6 is the one that passed.
-kmp (Aug 89)
References: Chapter 1, Section 1.5, Working draft of standard
Edit history: 8-JAN-89, Version 1 by Masinter
3-FEB-89, Version 2 by Chapman
10-MAR-89, Version 3 by Chapman
30-MAY-89, Version 4 by Pierson
20-JUN-89, Version 5 by Chapman
Problem: Is it OK to return extra values from Common Lisp functions?
A function that is specified by the standard must return EXACTLY the number
of return values specified by the standard.
The following functions are explicited permitted to have additional
The reason is that additional arguments are visible to otherwise
portable programs. For instance, (multiple-value-call #'cons (floor x
y)) looks portable, but it will try to pass the wrong number of
arguments to CONS if FLOOR returns an extra value.
The order of the above list is by page number in CLtL.
At least one implementation returns extra values for certain functions
not currently specified to return those values.
Implementations and their associated documentation that now contain
functions that return extra values will have to change.
Programs will potentially become more portable.
See Adoption Cost.
Pierson created the original list, Moon revised the list.
"The ones that I care the most about are gethash and read-line."