Um, I thought I'd already checked this in.
Anyway, this is the changes to the with-statement
so that __exit__ must return a true value in order
for a pending exception to be ignored.
The PEP (343) is already updated.
diff --git a/Lib/compiler/pyassem.py b/Lib/compiler/pyassem.py
index b59661f..82ff396 100644
--- a/Lib/compiler/pyassem.py
+++ b/Lib/compiler/pyassem.py
@@ -779,7 +779,7 @@
         'SETUP_EXCEPT': 3,
         'SETUP_FINALLY': 3,
         'FOR_ITER': 1,
-        'WITH_CLEANUP': 3,
+        'WITH_CLEANUP': -1,
         }
     # use pattern match
     patterns = [