[issue38105] hash collision when hash(x) == -2 causes many calls to __eq__

[Guido Imperiale]

Guido Imperiale <crusade...@gmail.com> added the comment:

Forgot a counter-example:

{C(1, 0), C(2, 0)}
C((1, 0)).__hash__
C((2, 0)).__hash__
C((1, 0)).__eq__(C((2, 0)))
{C((1, 0)), C((2, 0))}

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<https://bugs.python.org/issue38105>
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