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DEFMACRO and &WHOLE and &lossage.

&WHOLE isn't supported in VAX-NIL's Defmacro either, it would just be a special case
to check for it, if it were useful though ...

As far as "&..." words in general go, to make sure that people don't
get screwed, for example by using something that may be a good keyword
in the future, the system gobbles all "&..." words in effect by
having a pname check for them in the LAMBDA-binding section of the compiler,
and interpreter. This check doesn't cost very much and covers all possible
lossage of this class in a central location. I'd recommend it for the Lispm too.