[docs] [issue28516] contextlib.ExitStack.__enter__ has trivial but undocumented behavior

[Martin Panter]

Martin Panter added the comment:

I agree it is good to explicitly document the __enter__() result, rather than relying on assumptions and example code. The patch looks good to me.

I don’t understand the problem with pop_all() though. Is there still a problem if we apply your patch?

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nosy: +martin.panter
stage:  -> patch review
versions:  -Python 3.3, Python 3.4

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