[issue19660] decorator syntax: allow testlist instead of just dotted_name

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

Real world example where this actually came up:

https://github.com/jupyter-widgets/ipywidgets/issues/430#issuecomment-247016263

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nosy: +jdemeyer

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19660>
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