Message8023

isinstance() and issubclass() fail with abc.ABCMeta in Jython. They work in CPython.

$ cat abc_test.py
import abc
class A(abc.ABCMeta): pass
print(isinstance(0, abc.ABCMeta))
print(issubclass(A, abc.ABCMeta))
print(issubclass(abc.ABCMeta, abc.ABCMeta))
$ python2.7 abc_test.py
False
True
True
$ jython2.7 abc_test.py
Traceback (most recent call last):
  File "abc_test.py", line 3, in <module>
    print(isinstance(0, abc.ABCMeta))
RuntimeError: maximum recursion depth exceeded in __instancecheck__