title: F# defining/using a type/module in another file in the same project
body: <p>This will hopefully be an easy one.  I have an F# project (latest F# CTP) with two files (Program.fs, Stack.fs).  In Stack.fs I have a simple namespace and type definition</p>
  
  <p>Stack.fs</p>
  
  <pre><code>namespace Col
  
  type Stack= 
   ...
  </code></pre>
  
  <p>Now I try to include the namespace in Program.fs by declaring</p>
  
  <pre><code>open Col
  </code></pre>
  
  <p>This doesn't work and gives me the error "The namespace or module Col is not defined."  Yet it's defined within the same project.  I've got to be missing something obvious</p>