using System;
using System.Linq;
using System.Linq.Expressions;
 
public class Test
{
	public static void Main() {
		var e = (Func<int?>)Expression.Lambda(
			typeof(Func<int?>)
		,   Expression.Condition(
                Expression.Constant(false)
            ,   Expression.Default(typeof(int?))
            ,   Expression.Convert(Expression.Constant(1), typeof(int?))
            ,   typeof(int?)
            )
        ).Compile();
        Console.WriteLine("'{0}'", e());
	}
}

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