Exception Chaining missing method for suppressing context

Lib/traceback.py

--- a/Lib/traceback.py	Wed Feb 15 23:45:34 2012 +0100
+++ b/Lib/traceback.py	Wed Feb 15 22:51:26 2012 -0800
@@ -120,14 +120,14 @@
     seen.add(exc)
     its = []
     cause = exc.__cause__
-    if cause is not None and cause not in seen:
-        its.append(_iter_chain(cause, None, seen))
-        its.append([(_cause_message, None)])
-    else:
+    if cause is Ellipsis:
         context = exc.__context__
         if context is not None and context not in seen:
             its.append(_iter_chain(context, None, seen))
             its.append([(_context_message, None)])
+    elif cause is not None and cause not in seen:
+        its.append(_iter_chain(cause, False, seen))
+        its.append([(_cause_message, None)])
     its.append([(exc, custom_tb or exc.__traceback__)])
     # itertools.chain is in an extension module and may be unavailable
     for it in its: