}");             builder.AddEndpoint(endpoint);              // Act             var root = builder.BuildDfaTree();              // Assert             Assert.Null(root.Matches);             Assert.Null(root.Literals);              var a = root.Parameters;             Assert.Null(a.Matches);             Assert.Null(a.Literals);              var b = a.Parameters;             Assert.Null(b.Matches);             Assert.Null(b.