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using System;
using System.Linq.Expressions;
 
namespace X
{
    public class ObjectSet<T>
    {
        public T[] x;
    }
 
    public static class ObjectContextExtensions
    {
 
        public static T[] Find<T>(this ObjectSet<T> set, int id, params string[] includes) where T : class
        {
            Console.WriteLine("second");
            return set.x;
        }
 
        public static T[] Find<T>(this ObjectSet<T> set, int id, params Expression<Func<T, object>>[] includes) where T : class
        {
            Console.WriteLine("first");
            return set.x;
        }
 
 
    }
 
    public class Test
    {
        public static void Main()
        {
            new ObjectSet<string>().Find(0);
            Console.ReadKey();
        }
    }
}

prog.cs(33,37): error CS0121: The call is ambiguous between the following methods or properties: `X.ObjectContextExtensions.Find<string>(this X.ObjectSet<string>, int, params string[])' and `X.ObjectContextExtensions.Find<string>(this X.ObjectSet<string>, int, params System.Linq.Expressions.Expression<System.Func<string,object>>[])'
prog.cs(14,27): (Location of the symbol related to previous error)
prog.cs(20,27): (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty