move intern to sys, make intern() optionally warn

[anthonybaxter]

BPO	1728741
Files	intern-to-sys.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 = None
closed_at = <Date 2010-07-10.15:59:36.963>
created_at = <Date 2007-05-31.06:29:11.000>
labels = ['interpreter-core', 'type-feature']
title = 'move intern to sys, make intern() optionally warn'
updated_at = <Date 2010-07-10.15:59:36.962>
user = 'https://bugs.python.org/anthonybaxter'

bugs.python.org fields:

activity = <Date 2010-07-10.15:59:36.962>
actor = 'benjamin.peterson'
assignee = 'nnorwitz'
closed = True
closed_date = <Date 2010-07-10.15:59:36.963>
closer = 'benjamin.peterson'
components = ['Interpreter Core']
creation = <Date 2007-05-31.06:29:11.000>
creator = 'anthonybaxter'
dependencies = []
files = ['8025']
hgrepos = []
issue_num = 1728741
keywords = ['patch']
message_count = 1.0
messages = ['52705']
nosy_count = 2.0
nosy_names = ['nnorwitz', 'anthonybaxter']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'test needed'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue1728741'
versions = ['Python 3.2']

[anthonybaxter]

This patch moves intern() to sys.intern(). intern() will still work - it optionally issues a warning (based on the 3.x compat flag) then calls across to sys.intern()