PEP 525 asynchronous generators implementation

[1st1]

BPO	28003
Nosy	@vstinner, @ambv, @vadmium, @1st1
Files	asyncgen_1.patch async_gen.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/1st1'
closed_at = <Date 2016-09-09.05:02:50.005>
created_at = <Date 2016-09-07.17:29:34.352>
labels = ['interpreter-core', 'type-feature']
title = 'PEP 525 asynchronous generators implementation'
updated_at = <Date 2016-11-09.00:46:48.548>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2016-11-09.00:46:48.548>
actor = 'python-dev'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2016-09-09.05:02:50.005>
closer = 'yselivanov'
components = ['Interpreter Core']
creation = <Date 2016-09-07.17:29:34.352>
creator = 'yselivanov'
dependencies = []
files = ['44443', '44484']
hgrepos = []
issue_num = 28003
keywords = ['patch']
message_count = 7.0
messages = ['274845', '275257', '275258', '275270', '275272', '275273', '280365']
nosy_count = 5.0
nosy_names = ['vstinner', 'lukasz.langa', 'python-dev', 'martin.panter', 'yselivanov']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue28003'
versions = ['Python 3.6']

[1st1]

The PEP has been accepted, let's review the reference implementation and get it committed.

[python-dev]

New changeset 5259588983ca by Yury Selivanov in branch 'default':
Issue bpo-28003: Implement PEP-525 -- Asynchronous Generators.
https://hg.python.org/cpython/rev/5259588983ca

[1st1]

Committed. Thanks Victor for the review!

[vadmium]

I am getting a new GCC warning:

./Python/sysmodule.c:1425:28: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
{"set_asyncgen_hooks", sys_set_asyncgen_hooks,
^~~~~~~~~~~~~~~~~~~~~~
./Python/sysmodule.c:1425:28: note: (near initialization for ‘sys_methods[34].ml_meth’)

[python-dev]

New changeset 910e293663cb by Yury Selivanov in branch 'default':
Issue bpo-28003: Fix a compiler warning
https://hg.python.org/cpython/rev/910e293663cb

[1st1]

Thanks, Martin, it should be fixed now.

[python-dev]

New changeset 9f32ef6b210b by Yury Selivanov in branch '3.6':
Issue bpo-28003: Make WrappedVal, ASend and AThrow GC types
https://hg.python.org/cpython/rev/9f32ef6b210b

New changeset 6f51b495656c by Yury Selivanov in branch 'default':
Merge 3.6 (issue bpo-28003)
https://hg.python.org/cpython/rev/6f51b495656c