diff -r fc91c4a3dfe2 -r a85a0303bcb8 src/BytecodeCompiler.cpp
--- a/src/BytecodeCompiler.cpp	Sat Aug 04 23:58:23 2012 -0700
+++ b/src/BytecodeCompiler.cpp	Sun Aug 05 00:31:20 2012 -0700
@@ -539,11 +539,7 @@
     node->right()->accept(this);
     __ note_position(node->pos());
     __ bounds();
-
-    if (node->type()->isArray())
-        __ getarray_o();
-    else
-        __ getarray(node->type());
+    __ getarray(node->type());
 }
 
 void
@@ -741,15 +737,15 @@
 static inline ArrayMap *
 BuildArrayMap(Zone *zone, Handle<Type> type)
 {
-    Local<ArrayMap> contained(zone);
-    if (type->levels() > 1) {
-        Local<Type> containedType(zone, type->contained());
-        contained = BuildArrayMap(zone, containedType);
-        if (!contained)
-            return NULL;
-    }
+    if (type->newMap())
+        return ArrayMap::cast(type->newMap());
 
-    return ArrayMap::New(zone, type, contained);
+    Local<ArrayMap> map(zone, ArrayMap::New(zone, type));
+    if (!map)
+        return NULL;
+
+    type->setNewMap(map);
+    return map;
 }
 
 void