def match?
      predicate.is_a?(Predicated::Equal) &&
              predicate.left.is_a?(String) &&
              predicate.right.is_a?(String)
    end
def match?
      predicate.is_a?(Predicated::Equal) &&
              predicate.left.is_a?(String) &&
              predicate.right.is_a?(String)
    end
tell FailureMessage::Formatter about us