grinder

[Gyro at MIT-AI (Scott W. Layson)]

In system 27.4, with microcode 645, on LISP Machine Four:
Something strange seems to be wrong with this (system 27) grinder.  I'm trying
to run (MEXP) and keep getting errors like
"The argument CONS was #<DTP-LOCATIVE 104...>, which is not a CONS
While in the function CAR-LOCATION  SI:GRIND-AND  SI:GRIND-FORM"

Also, when I try to grind a not-particularly-complicated sexp using (grindef),
I get:
"The variable EH:CONDITION-HANDLERS is unbound.
While in the function SI:GRIND-COUNT-IO SI:PRINT-RAW-STRING  SI:PRINT-PNAME-STRING"

I hope this is enough info to locate the bug.  It seems bad enough that
you should have no trouble regenerating it.