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While the fix works as advertised, it breaks a similar existing test case:
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ERROR: test_positional_args (ctypes.test.test_structures.StructureTestCase)
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Traceback (most recent call last):
 File "/Users/jeff/sandbox/src/python3.7/cpython/Lib/ctypes/test/test_structures.py", line 390, in test_positional_args
 z = Z(1, 2, 3, 4, 5, 6)
IndexError: list index out of range
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Below is the relevant test code:
 class W(Structure):
 _fields_ = [("a", c_int), ("b", c_int)]
 class X(W):
 _fields_ = [("c", c_int)]
 class Y(X):
 pass
 class Z(Y):
 _fields_ = [("d", c_int), ("e", c_int), ("f", c_int)]
 z = Z(1, 2, 3, 4, 5, 6)
It similar but slightly different from the provided test case:
 libm = CDLL(find_library('m'))
 class Base(Structure):
 _fields_ = [('y', c_double),
 ('x', c_double)]
 class Mid(Base):
 pass
 Mid._fields_ = []
 class Vector(Mid): pass
 libm.atan2.argtypes = [Vector]
 libm.atan2.restype = c_double
 arg = Vector(y=0.0, x=-1.0)
I will do some more digging.