implement chained exception tracebacks
patch from Antoine Pitrou #3112
diff --git a/Lib/test/test_raise.py b/Lib/test/test_raise.py
index 3072c14..ba9cfc5 100644
--- a/Lib/test/test_raise.py
+++ b/Lib/test/test_raise.py
@@ -278,6 +278,30 @@
else:
self.fail("No exception raised")
+ def test_cycle_broken(self):
+ # Self-cycles (when re-raising a caught exception) are broken
+ try:
+ try:
+ 1/0
+ except ZeroDivisionError as e:
+ raise e
+ except ZeroDivisionError as e:
+ self.failUnless(e.__context__ is None, e.__context__)
+
+ def test_reraise_cycle_broken(self):
+ # Non-trivial context cycles (through re-raising a previous exception)
+ # are broken too.
+ try:
+ try:
+ xyzzy
+ except NameError as a:
+ try:
+ 1/0
+ except ZeroDivisionError:
+ raise a
+ except NameError as e:
+ self.failUnless(e.__context__.__context__ is None)
+
class TestRemovedFunctionality(unittest.TestCase):
def test_tuples(self):