[issue14439] Easier error diagnosis when bootstrapping the runpy module in main

[Nick Coghlan]

Changes by Nick Coghlan <ncoghlan at gmail.com>:


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title: RunModule(): display the traceback on failure -> Easier error diagnosis when bootstrapping the runpy module in main

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14439>
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