[pro] (values) for for-effect functions

[Martin Simmons]

I think it is confusing to use (values) for that purpose, because "no values"
is also a valid return value (e.g. for reader macro functions
http://www.lispworks.com/documentation/HyperSpec/Body/02_add.htm).

I would make it a macro, called something like void.

OTOH, use of (values) or (void) will prevent tail call optimization, so may be
undesirable.

-- 
Martin Simmons
LispWorks Ltd
http://www.lispworks.com/