Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Looks this is due to the method calls optimization (issue26110). We now avoid 
to create a temporary bound method, and an error with different message is 
raised on this path.

>>> set.add(0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: descriptor 'add' requires a 'set' object but received a 'int'
>>> set.add.__get__(0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: descriptor 'add' for 'set' objects doesn't apply to 'int' object

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nosy: +inada.naoki, yselivanov

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<https://bugs.python.org/issue36026>
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