fix COERCE to unfinalized extended sequence classes

Just before we're about to create an object, finalize the class if it
isn't already finalized, so that we can get at the class prototype.

diff --git a/NEWS b/NEWS
index c331f18..13d8c9d 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,8 @@
 changes relative to sbcl-1.0.50:
   * bug fix: correct RIP offset calculation in SSE comparison and shuffle
     instructions. (lp#814688)
+  * bug fix: COERCE to unfinalized extended sequence classes now works.
+    (reported by Jan Moringen; lp#815155)
 
 changes in sbcl-1.0.50 relative to sbcl-1.0.49:
   * enhancement: errors from FD handlers now provide a restart to remove

diff --git a/src/code/coerce.lisp b/src/code/coerce.lisp
index 2fc9ff1..81f27b2 100644 (file)
--- a/src/code/coerce.lisp
+++ b/src/code/coerce.lisp
@@ -241,6 +241,8 @@
         ((and (csubtypep type (specifier-type 'sequence))
               (find-class output-type-spec nil))
          (let ((class (find-class output-type-spec)))
+           (unless (sb!mop:class-finalized-p class)
+             (sb!mop:finalize-inheritance class))
            (sb!sequence:make-sequence-like
             (sb!mop:class-prototype class)
             (length object) :initial-contents object)))