[issue19428] marshal: error cases are not documented

[Roundup Robot]

Roundup Robot added the comment:

New changeset 11958c69a4b2 by Victor Stinner in branch 'default':
Issue #19428: zipimport now handles errors when reading truncated or invalid
http://hg.python.org/cpython/rev/11958c69a4b2

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nosy: +python-dev

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<http://bugs.python.org/issue19428>
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