[issue20422] Signature.from_builtin should raise a ValueError when no signature can be provided

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9433b380ad33 by Yury Selivanov in branch 'default':
inspect.Signature: Make from_builtin to raise an exception if no signature can
http://hg.python.org/cpython/rev/9433b380ad33

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nosy: +python-dev

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<http://bugs.python.org/issue20422>
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