anchor.diff:  open System.IO
   open Plainion.IronDoc.Parsing
   open Plainion.IronDoc.Rendering
  -open System.Threading
   open System
  +open System.Diagnostics
   
   let generateTypeDoc writer t = 
       renderType writer t
  +
  +type Tree =
  +  | Tree of string * Tree list
   
   /// Root folder per assembly.
   /// Sub-folder per namespace
  
positive.code:         types
          |> Seq.iter(fun x -> writer.WriteLine( sprintf "* [%s](%s)" x.name (x.name + ".md") ))
  
      namespaces
      |> Seq.iter renderNameSpace
  
      
  let generateAssemblyFileDoc outputFolder assemblyFile  = 
  
negative.code: 
          // render summary file
          use writer =  new StreamWriter(Path.Combine(folder, "ReadMe.md")) 
          renderHeadline writer 1 fullName
          writer.WriteLine()
  
          renderHeadline writer 2 "Types"
  