[issue36457] functools.singledispatchmethod interacts poorly with subclasses

[Tim Mitchell]

Tim Mitchell <tim.mitchell at seequent.com> added the comment:

Attached is an improved implementation that does not use a module level register() function.  
It makes the code in the original post work as expected: The `@BaseVisitor.visit.register()` decorator on the `AVisitor` class does not modify the base class dispatch table.  This works by constructing the dispatch registry in the `__init_subclass__` method instead.

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Added file: https://bugs.python.org/file48261/singledispatchmethod.py

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