0.7.6.29:

[sbcl.git] / src / compiler / generic / vm-type.lisp

diff --git a/src/compiler/generic/vm-type.lisp b/src/compiler/generic/vm-type.lisp
index 2e0621c..279ec9d 100644 (file)
--- 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*)