Added UserData support

Ycicle/Program.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Text;
 using Upsilon;
 using Upsilon.Evaluator;
@@ -17,7 +18,6 @@ namespace Ycicle
                 Console.Write("» ");
                 var input = Console.ReadLine();
                 if (input == "exit") return;
-
                 script = script == null ? new Script(input) : Script.ContinueWith(script, input);
 
                 if (script.Diagnostics.Messages.Count > 0)
@@ -32,8 +32,8 @@ namespace Ycicle
                     continue;
                 }
                 //Console.WriteLine(script.PrettyPrintSyntaxTree());
+                var evaluate = script.Evaluate<double>();
 
-                var evaluate = script.Evaluate();
                 if (script.Diagnostics.Messages.Count > 0)
                 {
                     Console.ForegroundColor = ConsoleColor.Red;