diff -r f9c4371d59d4 -r 7721042bdb67 src/Interpreter.cpp
--- a/src/Interpreter.cpp	Thu Dec 27 21:07:03 2012 -0800
+++ b/src/Interpreter.cpp	Fri Dec 28 17:13:51 2012 -0800
@@ -986,6 +986,26 @@
     break;
 }
 
+case OP_DEPARRAY:
+{
+    Local<ArrayMap> map(zone, ArrayMap::cast(top.fp->code()->object(READ_UINT32(top.pc))));
+    Local<Array> array(zone, Array::cast(top.sp[-2].obj));
+    int index = top.sp[-1].i32;
+
+    // We allow taking 0-length dependent arrays.
+    if (index < 0 || unsigned(index) > array->length()) {
+        zone->reportError(Message_ArrayIndexOutOfBounds, index, array->length());
+        goto error;
+    }
+
+    top.sp[-2].obj = DependentArray::New(zone, array, map, index);
+    if (!top.sp[-2].obj)
+        goto error;
+
+    top.sp--;
+    break;
+}
+
 default:
     assert(false);
     return false;