Make rlcompleter avoid duplicate global names

BPO	25663
Nosy	@vadmium, @serhiy-storchaka
Files	global-dupes.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 2015-11-24.02:07:50.922>
created_at = <Date 2015-11-19.02:14:20.907>
labels = ['type-bug', 'library']
title = 'Make rlcompleter avoid duplicate global names'
updated_at = <Date 2015-11-24.02:07:50.921>
user = 'https://github.com/vadmium'

bugs.python.org fields:

activity = <Date 2015-11-24.02:07:50.921>
actor = 'martin.panter'
assignee = 'none'
closed = True
closed_date = <Date 2015-11-24.02:07:50.922>
closer = 'martin.panter'
components = ['Library (Lib)']
creation = <Date 2015-11-19.02:14:20.907>
creator = 'martin.panter'
dependencies = []
files = ['41071']
hgrepos = []
issue_num = 25663
keywords = ['patch']
message_count = 5.0
messages = ['254873', '254882', '255238', '255239', '255243']
nosy_count = 3.0
nosy_names = ['python-dev', 'martin.panter', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25663'
versions = ['Python 2.7', 'Python 3.4', 'Python 3.5', 'Python 3.6']