[issue23934] inspect.signature reporting "()" for all builtin & extension types

[Nick Coghlan]

Nick Coghlan added the comment:

The main missing piece now is test fodder for this error. The simplest near-term option would be to use one of the actual builtins, such as 'str'.

In Python 3.5+ we could borrow the matmulType that was added to _testcapi to test the "@" operator, future-proofing the test against eventual conversion of the builtin types to support Argument Clinic.

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<http://bugs.python.org/issue23934>
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