title: c# 7 tuples . not able to use tuples in mac dotnet core 1.1
body: <p>I am trying to implement tuples c# 7 new feature in Visual Studio Code in macOS.</p>
  
  <pre><code>   using System;
     using System.Collections.Generic;
  
     namespace newcsharp
     {
      public class Program
      {
          public static void Main(string[] args)
          {
              int[] numbers = { 1, 3, 4, 10, 6, 20, 78, 15, 6 };
              var result = Range(numbers);
              Console.ReadLine();
          }
  
          private static (int Max, int Min) Range(IEnumerable&lt;int&gt; numbers)
          {
              int min = int.MaxValue;
              int max = int.MinValue;
              foreach (var n in numbers)
              {
                  min = (n &lt; min) ? n : min;
                  max = (n &gt; max) ? n : max;
              }
              return (max, min);
          }
        }
     }
  </code></pre>
  
  <p>I am getting the following erros.
  <a href="https://i.stack.imgur.com/UJ2qE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UJ2qE.png" alt="enter image description here"></a></p>
  
  <p>I included System.ValueTuple package for using tuples feature in my project.</p>
  
  <p>My project.json </p>
  
  <pre><code>{
    "version": "1.0.0-*",
    "buildOptions": {
      "emitEntryPoint": true
    },
    "dependencies": {
      "Microsoft.NETCore.App": {
        "type": "platform",
        "version": "1.1.0"
      },
      "System.ValueTuple": "4.3.0"
    },
    "frameworks": {
      "netcoreapp1.1": {
        "imports": "dnxcore50"
      }
    },
    "tooling": {
      "defaultNamespace": "newcsharp"
    }
  }
  </code></pre>
  
  <p>any help appreciated. </p>