public void NotImplemented()
        {
            var p = new Pattern(3, Entity.PatType.COMMON, Const.Patterns.AlwaysTrue);

            AssertExceptionThrown((() =>
            {
                p.Check();
                return(true);
            }), "@");
            AssertExceptionThrown((() =>
            {
                var _ = p == p + 1;
                return(true);
            }), "@");
            AssertExceptionThrown((() =>
            {
                p.Simplify();
                return(true);
            }), "@");
        }