, Assert.Single(a.Matches));             Assert.Null(a.Literals);             Assert.Null(a.Parameters);              // Catch-all nodes include an extra transition that loops to process             // extra segments.             var catchAll = a.CatchAll;             Assert.Same(endpoint, Assert.Single(catchAll.Matches));             Assert.Null(catchAll.Literals);             Assert.Same(catchAll, catchAll.Parameters);             Assert.Same(catchAll, catchAll.CatchAll);         }          [Fact]         public void BuildDfaTree_SingleEndpoint_CatchAll