[docs] [issue13557] exec of list comprehension fails on NameError

[Florent Xicluna]

Changes by Florent Xicluna <florent.xicluna at gmail.com>:


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nosy: +Trundle, anikom15, daniel.urban, flox, jonathan.hartley, josmiley, michael.foord, mjs0, rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13557>
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