title: What is wrong with this simple F# block?
body: <p>I have a test in C# that looks like this:</p>
  
  <pre><code>public void CanLog()
  {
      ModUnderTest.Log.Info("HI");
  }
  </code></pre>
  
  <p>This C# code throws a Null Reference exception saying that <code>ModUnderTest.Log</code> is null in the test. Here is the code under test:</p>
  
  <pre><code>module ModUnderTest
      let Log = log4net.LogManager.GetLogger("name")
  </code></pre>
  
  <p>Why does this not work? It compiles fine but fails at runtime. </p>