[issue20381] Argument Clinic: expression default arguments broken

[Zachary Ware]

Zachary Ware added the comment:

How does this one strike you?  Somewhat reversed logic compared to the first patch, but with this one we get either success or a nicely formatted fail message, no more tracebacks.

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Added file: http://bugs.python.org/file33691/issue20381.v2.diff

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