[issue27985] Implement PEP 526

[Yury Selivanov]

Yury Selivanov added the comment:

Ivan, take a look at my patch - i've fixed the refleak.  It was in STORE_ANNOTATION opcode, you didn't DECREF `ann` consistently in all error branches.  Also, you should never "break" in ceval -- only "goto error" or "DISPATCH()"

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Added file: http://bugs.python.org/file44474/hg-pep-526-v3.diff

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