anchor.diff:        
   /// Scans immediately for include files
   /// Files will be memoized
  -let ScanImmediately includes =
  +let ScanImmediately includes : EagerFileSet =
     Scan includes |> Seq.toList    
     
   /// Include prefix operator
  
positive.code:        
  /// Lazy scan for include files
  /// Will be processed at the time when needed
  let Scan includes =
    Files includes.BaseDirectories includes.Includes includes.Excludes
  
  /// Adds a directory as baseDirectory for fileIncludes  
  
negative.code: open System.Text
  open System.Text.RegularExpressions
  
  type EagerFileSet = string list
  type LazyFileSet = string seq
  
  type RegexEntry =
    { IsRecursive : bool;
  