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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace たぷるテスト___
{
    class Program
    {
        static Tuple<int, int, string> F()
        {
            return Tuple.Create(1, 2, "hoge");
        }
        static void Main(string[] args)
        {
            var T = F();
 
            Console.WriteLine("{0},{1},{2}", T.Item1, T.Item2, T.Item3);
            return ;
        }
    }
}

prog.cs(10,16): error CS0246: The type or namespace name `Tuple' could not be found. Are you missing a using directive or an assembly reference?
Compilation failed: 1 error(s), 0 warnings

Standard output is empty