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Re: null LAMBDA bodies?

I agree with KMP; all of those things should be permitted.  That is
exactly the sort of thing that macros can generate easily.  After all,
we allow PROGs (and therefore DOs) with null bodies; we should also
allow PROGNs (and therefore LETs, LAMBDAs, etc) with null bodies.  Also
note that COND clauses have an "implicit PROGN" which may be empty.  I
think it is important that the language be consistent about this, for
the sake of clarity, and also that it allow empty PROGNs for the sake of