TeamCity fails to build projects using C# 7 : <p>TeamCity is throwing errors when I added new the output variable syntax in our latest code update:</p>

<pre><code>if (Enum.TryParse(input, out MyProject.ClassificationType classification))
{
    result.Classification = classification;
}
</code></pre>

<p>TeamCity threw this error:</p>

<p><code>[Csc] MyProject\MyCode.cs(125, 111): error CS1003: Syntax error, ',' expected</code></p>

<p>The code builds and runs fine in Visual Studio.</p>
