From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Thu, 18 Apr 2013 15:04:51 +0000 (-0400)
Subject: - remove reference to _exc_info before reraise to reduce cycles
X-Git-Tag: rel_0_8_1~13^2~10
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6d93918b9b68202fdcb1f76f865efd5cde154963;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

- remove reference to _exc_info before reraise to reduce cycles
---

diff --git a/lib/sqlalchemy/util/langhelpers.py b/lib/sqlalchemy/util/langhelpers.py
index bba8ad734e..f6d9164e6c 100644
--- a/lib/sqlalchemy/util/langhelpers.py
+++ b/lib/sqlalchemy/util/langhelpers.py
@@ -51,10 +51,13 @@ class safe_reraise(object):
         self._exc_info = sys.exc_info()
 
     def __exit__(self, type_, value, traceback):
+        # see #2703 for notes
         if type_ is None:
             exc_type, exc_value, exc_tb = self._exc_info
+            self._exc_info = None   # remove potential circular references
             compat.reraise(exc_type, exc_value, exc_tb)
         else:
+            self._exc_info = None   # remove potential circular references
             compat.reraise(type_, value, traceback)
 
 def decode_slice(slc):