[issue22166] test_codecs leaks references

[STINNER Victor]

STINNER Victor added the comment:

ExceptionChainingTest creates a random codec name. If you change the codec name to a fixed string like "xxx", ExceptionChainingTest.test_raise_by_type() doesn't leak anymore (when  test_codecs_fix1.patch is applied), but other tests start to fail.

We should maybe enhance the codecs API to be able to unregister a codec?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22166>
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