def differing_blocks(self):
        """
        :returns: A list of block matches that appear to differ
        """
        differing_blocks = []
        for (func_a, func_b) in self.function_matches:
            differing_blocks.extend(self.get_function_diff(func_a, func_b).differing_blocks)
        return differing_blocks
:returns: A list of block matches that appear to differ