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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def enum_type(self):
 """Return the integer type of an enum declaration. Returns a Type corresponding to an integer. If the cursor is not for an enum, this raises. """

        if not hasattr(self, '_enum_type'):
            assert self.kind == CursorKind.ENUM_DECL
            self._enum_type = conf.lib.clang_getEnumDeclIntegerType(self)

        return self._enum_type