diff -r bbb498ccb4ac -r 26e3035cdffc src/compiler/HIR.cpp
--- a/src/compiler/HIR.cpp	Sat Dec 22 23:18:57 2012 -0800
+++ b/src/compiler/HIR.cpp	Mon Dec 24 02:49:20 2012 -0800
@@ -19,6 +19,7 @@
 #include "AST.h"
 #include "HIR.h"
 #include "BytecodeEmitter.h"
+#include "../Strings.h"
 #include "../Heap-inl.h"
 #include "../Handles-inl.h"
 
@@ -39,6 +40,7 @@
 
     void visitFloat(HFloat *hir);
     void visitInteger(HInteger *hir);
+    void visitArray(HArray *hir);
     void visitCall(HCall *call);
     void visitStore(HStore *store);
     void visitBinary(HBinary *binary);
@@ -69,6 +71,18 @@
 }
 
 void
+HIRTranslator::visitArray(HArray *hir)
+{
+    __ object(hir->array());
+
+    if (!hir->type()->isConst()) {
+        // If the type isn't const, we have to assume a consumer may modify
+        // the array, and therefore we have to duplicate it here.
+        __ duparray(); 
+    }
+}
+
+void
 HIRTranslator::visitCall(HCall *call)
 {
     Local<FunctionType> fun(zone_, FunctionType::cast(call->callee()->type()));