[issue18244] singledispatch: When virtual-inheriting ABCs at distinct points in MRO, composed MRO is dependent on haystack ordering

[Raymond Hettinger]

Changes by Raymond Hettinger <raymond.hettinger at gmail.com>:


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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18244>
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