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0ab38e95bb
lint/ctypes: ext. abi fn-ptr in internal abi fn Fixes #94223. - In the improper ctypes lint, instead of skipping functions with internal ABIs, check that the signature doesn't contain any fn-ptr types with external ABIs that aren't FFI-safe. - When computing the ABI for fn-ptr types, remove an `unwrap` that assumed FFI-safe types in foreign fn-ptr types. - I'm not certain that this is the correct approach.