X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=tests%2Fclos.impure.lisp;h=e5cc14046c91e46398bd169339a95da3e9636a25;hb=23c0c48f562d7dc5d1615bf13cb831b46c91d106;hp=84c7ec33a1e83f106f65fb2a2575b2b222a191cb;hpb=8aa1742a4cf5fb4752148ace41a779482b195bd4;p=sbcl.git

diff --git a/tests/clos.impure.lisp b/tests/clos.impure.lisp
index 84c7ec3..e5cc140 100644
--- a/tests/clos.impure.lisp
+++ b/tests/clos.impure.lisp
@@ -1383,4 +1383,22 @@
 (make-instances-obsolete (find-class 'obsolete-again))
 (assert (not (is-a-structure-object-p *obsolete-again*)))
 
+;;; overeager optimization of slot-valuish things
+(defclass listoid ()
+  ((caroid :initarg :caroid)
+   (cdroid :initarg :cdroid :initform nil)))
+(defmethod lengthoid ((x listoid))
+  (let ((result 0))
+    (loop until (null x)
+          do (incf result) (setq x (slot-value x 'cdroid)))
+    result))
+(with-test (:name ((:setq :method-parameter) slot-value) :fails-on :sbcl)
+  (assert (= (lengthoid (make-instance 'listoid)) 1))
+  (error "the failure mode is an infinite loop")
+  (assert (= (lengthoid
+              (make-instance 'listoid :cdroid
+                             (make-instance 'listoid :cdroid
+                                            (make-instance 'listoid))))
+             3)))
+
 ;;;; success