Return matched keyword.

        If the node alias on a correct keyword (and only it), it matches.

def find_matching_builtin(self, node):
        """
        Return matched keyword.

        If the node alias on a correct keyword (and only it), it matches.
        """
        for path in EQUIVALENT_ITERATORS.keys():
            correct_alias = {path_to_node(path)}
            if self.aliases[node.func] == correct_alias:
                return path