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using System;
using System.Linq;
 
public class Test
{
        public static void Main()
        {
        var list = new List<string>() { "1", "2", "3" };
        foreach (var i in list.Distinct())
                        Console.WriteLine(i);
        }
}

prog.cs(8,24): error CS0246: The type or namespace name `List' could not be found. Are you missing a using directive or an assembly reference?
prog.cs(8,9): error CS0825: The contextual keyword `var' may only appear within a local variable declaration
prog.cs(9,27): error CS0841: A local variable `list' cannot be used before it is declared
Compilation failed: 3 error(s), 0 warnings

Standard output is empty