*CATCH vs named PROG

[Daniel L. Weinreb <DLW at MIT-AI>]

For the record, I did not forget about *CATCH; I was just being
sarcastic, for which I apologize.  Yes, RWK is right, it is dynamic and
not lexical.  So let us actually introduce a new form that IS lexical,
and use IT everywhere.  The compilers would be quite capable of
producing the same code for a DO surrounded by a lexical CATCH as they
do now for DO-NAMED.  I'm not kidding; I think this is the right
solution to the problem.