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class MC(type):
pass
class MC2(MC):
pass
class MC3(type):
pass
class A():
pass
assert type(A) == type
class B(metaclass=MC):
pass
assert type(B) == MC
class C(B):
pass
assert type(C) == MC
class D(metaclass=MC2):
pass
assert type(D) == MC2
class E(C, D, metaclass=MC):
pass
assert type(E) == MC2
class F(metaclass=MC3):
pass
assert type(F) == MC3
try:
class G(D, E, F):
pass
assert False
except TypeError:
pass