test_struct grew weird behavior under regrtest.py -R, due to a module-level cache.  Clearing the cache should make it stop showing up in refleak reports.
test_struct grew weird behavior under regrtest.py -R,
due to a module-level cache.  Clearing the cache should
make it stop showing up in refleak reports.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator