[issue35879] test_type_comments leaks references

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Found it! You need to call PyArena_AddPyObject(). I racked my brain and finally found the example code I needed at the end of new_identifier(). Please review quickly so we won't ship 3.8.0a1 with a memory leak.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35879>
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