[pypy-commit] pypy remove-list-smm-2: list.__add__ works only with lists as right operator.

[Manuel Jacob]

Author: Manuel Jacob
Branch: remove-list-smm-2
Changeset: r64274:d71699519e23
Date: 2013-05-18 11:25 +0200
http://bitbucket.org/pypy/pypy/changeset/d71699519e23/

Log:    list.__add__ works only with lists as right operator.

diff --git a/pypy/objspace/std/listobject.py b/pypy/objspace/std/listobject.py
--- a/pypy/objspace/std/listobject.py
+++ b/pypy/objspace/std/listobject.py
@@ -426,6 +426,8 @@
             return space.w_False
 
     def descr_add(self, space, w_list2):
+        if not isinstance(w_list2, W_ListObject):
+            return space.w_NotImplemented
         w_clone = self.clone()
         w_clone.extend(w_list2)
         return w_clone
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