title: Roslyn and .NET Runtime version
body: <p>Is it possible to use Roslyn compiler and new features of C# 6.0 with old versions of .NET Runtime (for example, .NET 4.0)?</p>
  
  <p>For example, I want use the expression-bodied members (<code>int S =&gt; x + y;</code> instead of <code>int S { get { return x + y; } }</code>) in .NET 4.0 application.</p>