CADR-1 dropping dead

[JONL at MIT-AI (Jon L White)]

CC: (BUG LISPM) at MIT-AI, RHB at MIT-AI

I'm unable to find the exact code which when compiled from a ZWEI
buffer caused CADR-1 to stop (no bells, whistles or whatever),
but it was during the period between 08:55 and 10:44 of Jan 29
when the AI machine was down;  I had filed away teh ZWEI buffer
at those two points, and continued to edit during AI's illnesses
by warm booting.  By the time AI came alive again, I had edited
out whatever caused it to lose, and can't seem to recreate it;
but RHB witnessed the event twice with me, so it seems not to
have been a fluke.