@staticmethod
def mergeable(x, y):
    """
        Compute the mergeability of two operators of this builder's type.

        Parameters
        ----------
        x : `nengo.builder.Operator`
            The operator being tested
        y : `nengo.builder.Operator`
            The operator being merged into (this is representative of a group
            of operators that have already been merged)

        Returns
        -------
        mergeable : bool
            True if ``x`` and ``y`` can be merged into a single built op,
            else ``False``.
        """
    return False
