[issue9731] ABCMeta.register should verify that methods are present

[Daniel Stutzbach]

Daniel Stutzbach <daniel at stutzbachenterprises.com> added the comment:

Would it be useful to provide a separate function to perform the check, which could be used by lint-style tools as well as automated tests?

It would be great if every call to .register in the standard library had a corresponding test that verified that the appropriate methods were defined.  That would prevent future oversights where methods are missing entirely.

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<http://bugs.python.org/issue9731>
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