[issue4922] set.add and set.discard are not conformant to collections.MutableSet interface

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

The comments were incorrect.
Mutating methods always return None.
Fixed in r68570.
Needs to be ported to 2.6, 3.0, and 3.1.

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assignee: rhettinger -> georg.brandl
keywords: +26backport
nosy: +georg.brandl
resolution:  -> fixed
versions: +Python 2.7, Python 3.0, Python 3.1

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