[docs] [issue15355] generator docs should mention already-executing exception

[Roundup Robot]

Roundup Robot added the comment:

New changeset dc4b00f51c48 by R David Murray in branch '3.2':
#15355: Mention already-executing Exception in generator docs.
http://hg.python.org/cpython/rev/dc4b00f51c48

New changeset 73f1ba3319dd by R David Murray in branch 'default':
Merge #15355: Mention already-executing Exception in generator docs.
http://hg.python.org/cpython/rev/73f1ba3319dd

New changeset a62309ae88a2 by R David Murray in branch '2.7':
#15355: Mention already-executing Exception in generator docs.
http://hg.python.org/cpython/rev/a62309ae88a2

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nosy: +python-dev

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