[issue3263] Odd code fragment in ABC definitions

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

This is precisely under discussion in issue2235:
if a base class is hashable, a derived class may set __hash__ to None,
and disallow hashing.

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nosy: +amaury.forgeotdarc

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3263>
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