BooInterpreter Class for XnaConsole

I've been using XnaConsole in a couple of projects. It's quite handy to have around, and easy to plug in to a project. The author asks for people to share when they use it with an interpreter of a new language (he provides an IronPython example). For a recent project I wanted to use Boo instead, so here's my Boo interpreter:

//
// Boo Interpreter for XNA Console
//
// Copyright (C) 2008 Max Battcher.  All Rights Reserved.
// Licensed under the Microsoft Permissive License (Ms-PL).
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using Boo.Lang.Compiler;
using Boo.Lang.Interpreter;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;


namespace XnaConsole
{
    /// <remarks>
    /// This class implements an interpreter using Boo
    /// </remarks>
    public class BooInterpreter
    {
        const string Prompt = ">>> ";
        const string PromptCont = "... ";
        const string Returned = "<<< {0}";
        string multi;
        public XnaConsoleComponent Console;

        InteractiveInterpreter interpreter;

        public InteractiveInterpreter Interpreter
        {
            get { return interpreter; }
        }

        /// <summary>
        /// Creates a new BooInterpreter
        /// </summary>
        public BooInterpreter(Microsoft.Xna.Framework.Game game, SpriteFont font)
        {
            interpreter = new InteractiveInterpreter();
            interpreter.Ducky = true; // Keep from having to make static type decisions in console
            interpreter.RememberLastValue = true;
            foreach (System.Reflection.Assembly assembly in System.AppDomain.CurrentDomain.GetAssemblies())
            {
                interpreter.References.Add(assembly);
            }
            interpreter.Eval("import Microsoft.Xna.Framework\nimport Microsoft.Xna.Framework.Graphics\nimport Microsoft.Xna.Framework.Content");

            multi = "";

            Console = new XnaConsoleComponent(game, font);
            game.Components.Add(Console);
            Console.Prompt(Prompt, Execute);
            AddGlobal("Console", Console);
        }

        /// <summary>
        /// Executes boo commands from the console.
        /// </summary>
        /// <param name="input"></param>
        /// <returns>Returns the execution results or error messages.</returns>
        public void Execute(string input)
        {
            object last;

            try
            {
                if ((input != "") && ((input[input.Length - 1].ToString() == ":") || (multi != ""))) //multiline block incomplete, ask for more
                {
                    multi += input + "\n";
                    Console.Prompt(PromptCont, Execute);
                }
                else if (multi != "" && input == "") // end of multiline
                {
                    input = multi; // make sure that multi is cleared, even if it returns ...

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