HIC@MIT-MC 07/09/79 03:06:58
To: (BUG LISPM) at MIT-MC
A) Create specials with PROGV, bind them to NIL
B) MAKUNBOUND them
C) Close over them
D) Access them in the closure
E) Discover that you get DTP-NULL trap as opposed to unbound.
I have fixed this error-handler bug.