[issue5256] rlcompleter adds builtins when custom dict is used

[Michele Orrù]

Changes by Michele Orrù <maker.py at gmail.com>:


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nosy: +ezio.melotti, mark.dickinson, pitrou, r.david.murray

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5256>
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