Argument Clinic: support cloning existing functions

[larryhastings]

BPO	20268
Nosy	@birkenfeld, @larryhastings, @serhiy-storchaka
Files	larry.clinic.clone.functions.diff.1.txt

^{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/larryhastings'
closed_at = <Date 2014-01-15.06:23:50.830>
created_at = <Date 2014-01-15.05:49:19.245>
labels = ['type-feature']
title = 'Argument Clinic: support cloning existing functions'
updated_at = <Date 2014-01-15.06:23:50.828>
user = 'https://github.com/larryhastings'

bugs.python.org fields:

activity = <Date 2014-01-15.06:23:50.828>
actor = 'larry'
assignee = 'larry'
closed = True
closed_date = <Date 2014-01-15.06:23:50.830>
closer = 'larry'
components = []
creation = <Date 2014-01-15.05:49:19.245>
creator = 'larry'
dependencies = []
files = ['33476']
hgrepos = []
issue_num = 20268
keywords = []
message_count = 6.0
messages = ['208143', '208144', '208145', '208146', '208147', '208148']
nosy_count = 4.0
nosy_names = ['georg.brandl', 'larry', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue20268'
versions = ['Python 3.4']

[larryhastings]

It was a quick hack: Clinic now has a syntax for cloning an existing
function! The first line of the function block should be

module.class.new_function [as c_basename] = module.class.existing_fn

Hurry up and give me a LGTM so you can use it everywhere! :D

[birkenfeld]

Functionality looks good. Implementation I can't say.

[larryhastings]

Shall I just check it in and fix it if it breaks?

[birkenfeld]

Sure!

[python-dev]

New changeset 565773aabafb by Larry Hastings in branch 'default':
Issue bpo-20268: Argument Clinic now supports cloning the parameters
http://hg.python.org/cpython/rev/565773aabafb

[larryhastings]

Begun, the clone war has.