six.moves.builtins causes strange exception

[benjaminp]

Originally reported by: Anonymous

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When Six is used with Click, a strange exception occurs here that can only be caught with except: and not except Exception::

Exception TypeError: TypeError("'NoneType' object is not callable",) in <bound method _NonClosingTextIOWrapper.__del__ of <_io.TextIOWrapper encoding='UTF-8'>> ignored

To reproduce, run the following:

#!python

import click
import six.moves.builtins

click.echo("Test")

click==6.6, six==1.10.0, python==2.7.11

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• Bitbucket: https://bitbucket.org/gutworth/six/issue/157