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from abstract_basecast import *
def check(flag):
if not flag:
raise RuntimeError("Test failed")
derived = DerivedClass()
derived.g()
check(isinstance(derived, BaseClass))
check(isinstance(derived, DerivedClass))
base = derived.f()
base.g()
check(isinstance(base, BaseClass))
check(not isinstance(base, DerivedClass))
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