X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fgeneric%2Fvm-type.lisp;h=279ec9d6b36a462fdfee8a331039a16820e32c90;hb=4dbc52ee4f9a4f566701f1d33e7916e8491b918b;hp=2e0621cfead7e9123589518e13f5c444262266d3;hpb=9347abeb5f42dc83d372c19b14e86204a6a588dd;p=sbcl.git

diff --git a/src/compiler/generic/vm-type.lisp b/src/compiler/generic/vm-type.lisp
index 2e0621c..279ec9d 100644
--- a/src/compiler/generic/vm-type.lisp
+++ b/src/compiler/generic/vm-type.lisp
@@ -130,7 +130,12 @@
 (defun specialize-array-type (type)
   (let ((eltype (array-type-element-type type)))
     (setf (array-type-specialized-element-type type)
-	  (if (eq eltype *wild-type*)
+	  (if (or (eq eltype *wild-type*)
+		  ;; This is slightly dubious, but not as dubious as
+		  ;; assuming that the upgraded-element-type should be
+		  ;; equal to T, given the way that the AREF
+		  ;; DERIVE-TYPE optimizer works.  -- CSR, 2002-08-19
+		  (unknown-type-p eltype))
 	      *wild-type*
 	      (dolist (stype-name *specialized-array-element-types*
 				  *universal-type*)