[issue2016] Crash when modifying the **kwargs passed to a function.

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

This could be turned into an assertion.
But beware that some extension writers may use code like
    PyObject_Call(callable, args, Py_None)
which works perfectly today.

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<http://bugs.python.org/issue2016>
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