Issue #9815: assertRaises now tries to clear references to local variables in the...

diff --cc Misc/NEWS
index 4539f4d2681ffea89876421ba525fb3287da5722,3975afa462556956a618b347e99e0e7f5df5ce38..c7115719fccb8ddbcaadf165f8fd3847aa02bcbf
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -60,10 -39,9 +60,13 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #9815: assertRaises now tries to clear references to local variables
+   in the exception's traceback.
+ 
 +- Issue #19940: ssl.cert_time_to_seconds() now interprets the given time
 +  string in the UTC timezone (as specified in RFC 5280), not the local
 +  timezone.
 +
  - Issue #13204: Calling sys.flags.__new__ would crash the interpreter,
    now it raises a TypeError.