anchor.diff:  let allSymbols = allSymbolsInEntities wholeProjectResults.AssemblySignature.Entities
   (**
   After checking the whole project, you can access the background results for individual files
  -in the project. This will be fast and will not invlove any additional checking.
  +in the project. This will be fast and will not involve any additional checking.
   *)
   
   let backgroundParseResults1, backgroundTypedParse1 = 
  
positive.code: 
  let projectOptions = 
      let sysLib nm = 
          if System.Environment.OSVersion.Platform = System.PlatformID.Win32NT then // file references only valid on Windows 
              System.Environment.GetFolderPath(System.Environment.SpecialFolder.ProgramFilesX86) +
              @"\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\" + nm + ".dll"
          else
  
negative.code:             sysDir ++ nm + ".dll" 
  
      let fsCore4300() = 
          if System.Environment.OSVersion.Platform = System.PlatformID.Win32NT then
              // file references only valid on Windows
              System.Environment.GetFolderPath(System.Environment.SpecialFolder.ProgramFilesX86) +
              @"\Reference Assemblies\Microsoft\FSharp\.NETFramework\v4.0\4.3.0.0\FSharp.Core.dll"  
          else 
  