code: def _build_return_code_enum():
      
      prefix = 'XTT_RETURN_'
      codes = {k[len(prefix):]:v for (k, v) in vars(_lib).items() if k.startswith(prefix)}
      return IntEnum('ReturnCode', codes)
docs: Creates an IntEnum containing all the XTT return codes.
  
      Finds all return codes by scanning the FFI for items whose names match
      the pattern "XTT_RETURN_<X>".  The name of the result enum value is the
      suffix "<X>".