diff -r f7e573226c2b -r 40746ab0a30b jitcraft/ObjectVisitor.h
--- a/jitcraft/ObjectVisitor.h	Sat Jul 14 18:43:34 2012 -0700
+++ b/jitcraft/ObjectVisitor.h	Sat Jul 14 21:01:52 2012 -0700
@@ -103,7 +103,8 @@
     }
 
     size_t iterateArray(Array *array, ArrayMap *map) {
-        if (map->type()->isArray()) {
+        assert(map->type()->isArray());
+        if (map->contained()) {
             unsigned length = array->nelements();
             Object **vec = array->objVec();
             for (unsigned i = 0; i < length; i++)