From 7b851d9bc2d97679a4aa3321972af9fc1b129a1d Mon Sep 17 00:00:00 2001
From: wlott <wlott>
Date: Wed, 2 Jun 1993 13:21:25 +0000
Subject: [PATCH] Fixed describe-instance-parts to not flame out when handed
 instances that don't happen to be defstruct structures.

---
 code/tty-inspect.lisp | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/code/tty-inspect.lisp b/code/tty-inspect.lisp
index 719e7d1d8..96840bf04 100644
--- a/code/tty-inspect.lisp
+++ b/code/tty-inspect.lisp
@@ -7,7 +7,7 @@
 ;;; Scott Fahlman or slisp-group@cs.cmu.edu.
 ;;;
 (ext:file-comment
-  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/tty-inspect.lisp,v 1.13 1993/05/29 07:01:10 wlott Exp $")
+  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/tty-inspect.lisp,v 1.14 1993/06/02 13:21:25 wlott Exp $")
 ;;;
 ;;; **********************************************************************
 ;;;
@@ -171,14 +171,15 @@
 	(cons "Package" (symbol-package object))))
 
 (defun describe-instance-parts (object kind)
-  (let ((dd-slots (dd-slots (layout-info (kernel:layout-of object))))
+  (let ((info (layout-info (kernel:layout-of object)))
 	(parts-list ()))
     (push (format nil "~s is a ~(~A~).~%" object kind) parts-list)
     (push t parts-list)
-    (dolist (dd-slot dd-slots (nreverse parts-list))
-      (push (cons (dsd-%name dd-slot)
-		  (funcall (dsd-accessor dd-slot) object))
-	    parts-list))))
+    (when (kernel::defstruct-description-p info)
+      (dolist (dd-slot (dd-slots info) (nreverse parts-list))
+	(push (cons (dsd-%name dd-slot)
+		    (funcall (dsd-accessor dd-slot) object))
+	      parts-list)))))
 
 (defun describe-function-parts (object)
   (let* ((type (kernel:get-type object))
-- 
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