title: valuetuple doesn't work for one of my 4.7.2 projects
body: <p>I have multiple projects in the solution, all targeting 4.7.2. I then add a method in a lib project that returns valueTuple. Multiple projects call this method, all projects are fine(compiled) except one project. This one project generates compiler error. </p>
  
  <pre><code>Error   CS1061  ValueTuple&lt;IEnumerable&lt;User&gt;, Dictionary&lt;string, string&gt;, Dictionary&lt;string, string&gt;&gt;' does not contain a definition for 'CreatedUsers' and no extension method 'CreatedUsers' accepting a first argument of type 'ValueTuple&lt;IEnumerable&lt;User&gt;, Dictionary&lt;string, string&gt;, Dictionary&lt;string, string&gt;&gt;' could be found (are you missing a using directive or an assembly reference?)
  </code></pre>
  
  <p>I've compared all nugets pkgs in this project with other projects, minor difference, I then unisntall those different nugets, still the same error. I searched around, knowing 4.7 has built in valuetuple, I then checked this project, it doesn't not have <code>System.ValueTuple</code> nuget, or hardcoded System.ValueTuple.dll anywhere. </p>
  
  <p>Please help. I can always go back to the Tuple&lt;> way, but valuetuple is cleaner. Unless you tell me there's more hidden issues ahead. </p>
  
  <p>Thanks!</p>
  
  <pre><code>The method that returns valuetuple 
  
  public static async Task&lt;(IEnumerable&lt;User&gt; CreatedUsers, Dictionary&lt;string, string&gt; ErrorMsgsA, Dictionary&lt;string, string&gt; ErrorMsgsB)&gt; CreateNewUsers(string param1, CreateUserDTO param2)
  
  {
  
  ... ...
  
  ... ...
  
  return (createdUs, ErrorMsgs_a, ErrorMsgs_b);
  
  }
  </code></pre>
  
  <p>The line that causes error:</p>
  
  <pre><code>var createUserResult = await CreateNewUsers(param1, param2);
  var created = createUserResult.CreatedUsers; //error
  </code></pre>
  
  <p>So that's it, compiler complains about not finding items in returned tuple. I listed here the compiler error which complains about the first item, "CreatedUsers", in valuetuple. There are actually one compiler error for each of other valuetuple items, "ErrorMsgsA", ErrorMsgsB. And remember, my other projects who reference itmes in this valuetuple are fine, no error.</p>