[issue24583] Crash when source set is changed during merging

[Raymond Hettinger]

Raymond Hettinger added the comment:

Can you produce a test case?

Perhaps the incref/decref pair ought to be moved into PyObject_RichCompareBool().  It doesn't make much sense for the callers to do the work.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24583>
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