eigenvalues, part: fell off the end

Here is what I get:
on linuxmint 15 32-bit
Maxima 5.29.1 http://maxima.sourceforge.net
using Lisp CMU Common Lisp 20d (20D Unicode)
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.

(%i1) display2d: false$

(%i2) ratmx: true$

(%i3) nullspace(matrix([0,0],[0,0]));

(%o3) span(matrix([0],[1]),matrix([1],[0]))

Ala'a



On Tue, Jul 30, 2013 at 2:35 AM, Raymond Toy <toy.raymond at gmail.com> wrote:

> >>>>> "Barton" == Barton Willis <willisb at unk.edu> writes:
>
>     Barton> (%i7) nullspace(matrix([0,0],[0,0])), ratmx : true;
>     Barton> Maxima encountered a Lisp error:
>     Barton> GREAT: internal error: unexpected MRAT argument
>     Barton> Automatically continuing.
>     Barton> To enable the Lisp debugger set *debugger-hook* to nil.
>     Barton> (%i8) build_info();
>     Barton> (%o8) build_info(version="5.30.0",timestamp="2013-06-01
> 21:29:43",host="i686-pc-mingw32",lisp_name="GNU Common Lisp
> (GCL)",lisp_version="GCL 2.6.8")'
>
>     Barton> Maybe I've forgotten something about using the backtrace with
> GCL?
>
>     Barton> (%i2) :lisp( setf *debugger-hook* nil)
>     Barton> NIL
>     Barton> (%i2) :lisp(setf use-fast-links nil)
>     Barton> NIL
>     Barton> (%i2) nullspace(matrix([0,0],[0,0])), ratmx : true;
>     Barton> GREAT: internal error: unexpected MRAT argument
>     Barton> Fast links are on: do (use-fast-links nil) for debugging
>     Barton> Broken at PROGN.  Type :H for Help.
>     Barton> 1 (Continue) Maxima top-level
>     Barton> 2 (Abort) Return to top level.
>     Barton> dbl:MAXIMA>> :bt
>     Barton> #0   RUN {} [ihs=4]
>     Barton> NIL
>     Barton> dbl:MAXIMA>>
>
> I can reproduce this issue (using current sources and cmucl).
>
> The error message (and partial backtrace) is:
>
> Error in function GREAT:  GREAT: internal error: unexpected MRAT argument
>    [Condition of type SIMPLE-ERROR]
>
> Restarts:
>   0: [MACSYMA-QUIT] Maxima top-level
>   1: [ABORT       ] Skip remaining initializations.
>
> Debug  (type H for help)
>
> (GREAT ((MRAT SIMP NIL NIL) 1 . 1) ((MRAT SIMP NIL NIL) 0 . 1))
> Source:
> ; File: /usr/local/google/home/rtoy/src/sourceforge/maxima/src/simp.lisp
> (ERROR "GREAT: internal error: unexpected MRAT argument")
> 0] back
>
> 0: (GREAT ((MRAT SIMP NIL NIL) 1 . 1) ((MRAT SIMP NIL NIL) 0 . 1))
> 1: (B-SEARCH-EXPR
>     (($MATRIX SIMP) ((MLIST SIMP) ((MRAT SIMP NIL NIL) 0 . 1))
>      ((MLIST SIMP) ((MRAT SIMP NIL NIL) 1 . 1)))
>     ((($MATRIX SIMP) ((MLIST SIMP) ((MRAT SIMP NIL NIL) 1 . 1))
>       ((MLIST SIMP) ((MRAT SIMP NIL NIL) 0 . 1))))
>     0
>     1)
> 2: ($ADJOIN
>     (($MATRIX SIMP) ((MLIST SIMP) ((MRAT SIMP NIL NIL) 0 . 1))
>      ((MLIST SIMP) ((MRAT SIMP NIL NIL) 1 . 1)))
>     (($SET SIMP)
>      (($MATRIX SIMP) ((MLIST SIMP) ((MRAT SIMP NIL NIL) 1 . 1))
>       ((MLIST SIMP) ((MRAT SIMP NIL NIL) 0 . 1)))))
>
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