FYI: Compile fixes when always using a local for method return value

Source/bindings/scripts/v8_types.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 649 matching lines @@
                                         extended_attributes,
                                         script_wrappable,
                                         release and release[i],
                                         for_main_world)
             for i, member_type in
             enumerate(idl_type.member_types)]
 
 IdlType.v8_set_return_value = v8_set_return_value
 IdlUnionType.v8_set_return_value = v8_set_return_value_union
 
-IdlType.release = property(lambda self: self.is_interface_type)
-IdlUnionType.release = property(
-    lambda self: [member_type.is_interface_type
-                  for member_type in self.member_types])
+
+def type_needs_release(idl_type):
+    return idl_type.is_interface_type and idl_type.base_type != 'SerializedScriptValue'
+
+
+def union_type_needs_release(idl_type):
+    return [type_needs_release(member_type)
+            for member_type in idl_type.member_types]
+
+IdlType.release = property(type_needs_release)
+IdlUnionType.release = property(union_type_needs_release)
 
 
 CPP_VALUE_TO_V8_VALUE = {
     # Built-in types
     'Date': 'v8DateOrNaN({cpp_value}, {isolate})',
     'DOMString': 'v8String({isolate}, {cpp_value})',
     'ByteString': 'v8String({isolate}, {cpp_value})',
     'ScalarValueString': 'v8String({isolate}, {cpp_value})',
     'boolean': 'v8Boolean({cpp_value}, {isolate})',
     'int': 'v8::Integer::New({isolate}, {cpp_value})',
@@ skipping 44 matching lines @@
     # - String types (String/AtomicString) represent null as a null string,
     #   i.e. one for which String::isNull() returns true.
     # - Wrapper types (raw pointer or RefPtr/PassRefPtr) represent null as
     #   a null pointer.
     return idl_type.is_nullable and (
         (idl_type.is_string_type or idl_type.is_wrapper_type) and
         not idl_type.native_array_element_type)
 
 IdlType.is_nullable_simple = property(is_nullable_simple)
 IdlUnionType.is_nullable_simple = False