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Re: Issue: MACRO-FUNCTION-ENVIRONMENT

Walter says: ``how about explicitly allowing NIL as the environment, indicating
the null lexical environment?  This is just as in GET-SETF-METHOD-ENVIRONMENT''

I thought of that, but didn't put it in because I couldn't find a reference to
it being allowed.  I now have one, but did we ever also say that NIL could be
passed as the second argument to MACROEXPAND and MACROEXPAND-1?

	Pavel