anchor.diff:  
   let projectOptions = 
       let sysLib nm = 
  -        if System.Environment.OSVersion.Platform = System.PlatformID.Win32NT then // file references only valid on Windows 
  +        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
  
positive.code: 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.
  *)
  
  let backgroundParseResults1, backgroundTypedParse1 = 
  
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 
  