use with_traceback correctly

diff --git a/Lib/unittest/case.py b/Lib/unittest/case.py
index ed17b6e5e2aad3ac34727df67c278cef989d2bcb..4f9c49665a315c41971bc271f1ddf41fcf273fe8 100644 (file)
--- a/Lib/unittest/case.py
+++ b/Lib/unittest/case.py
@@ -117,8 +117,7 @@ class _AssertRaisesContext(object):
             # let unexpected exceptions pass through
             return False
         #store exception, without traceback, for later retrieval
-        self.exc_value = exc_value
-        self.exc_value.with_traceback(None)
+        self.exc_value = exc_value.with_traceback(None)
         if self.expected_regex is None:
             return True