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Control characters in # macro.

The MacLisp #/C would return 303 not 3 since thats the bit
that is set if you try and hack keyboards with control and
meta.  MacLisp also has a #^<char> that uppercases <char>
and then xors it with 100 so that #^C is 3 (as is #^c) and
#^? is rubout. This is sometimes usefull in MacLisp but
never in LispMachine lisp, and I don't know about NIL.