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Vlad,
Thanks for the patch. A few nits:
 1. The test case is in 'test_bitfields.py'.
 I think it should go in 'test_structures.py'.
 2. The test case would probably be cleaner using a 'with' context
 manager:
 with self.assertRaises(TypeError):
 class S(Structure):
 _fields_ = [(b"x", c_int)]
 A few more test cases might be nice too.
 3. The TypeError message display something like:
 "structure field name must be string not bytes"
 maybe the following would be more understandable:
 "field name must be an object of type str not bytes"
 4. The 'ptr', 'len', and 'buf' initializers are unnecessary.
Otherwise, looks good.