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Corrected by revision 58958.
"with" is innocent. The problem is this function in abc.py which uses a
generator expression:
 def __instancecheck__(cls, instance):
 """Override for isinstance(instance, cls)."""
 return any(cls.__subclasscheck__(c)
 for c in {instance.__class__, type(instance)})
It is called both by pdb (deep inside 'print') and the debugged code (in
PyObject_MethodCall), and this reveals the bug.