GREAT/MRAT bug, was: alt_eigen more info

OK, here's a simpler example of the GREAT/MRAT bug.

(%i1) r : rat(x);
(%o1)/R/                               x
(%i2) :lisp $r
((MRAT SIMP ($X) (X15886)) (X15886 1 1) . 1)
(%i2) :lisp (great $r $r)
Maxima encountered a Lisp error:
 
CAR: 1 is not a list


Hope this helps,

Robert Dodier