anchor.diff:               (systemAssemblies |> List.exists (fun sysFile -> sysFile = fileNameWithoutExtension filename)))
           with _ ->
               false    
  -        
  +
       // This is not the complete set of search paths, it is just the set 
       // that is special to F# (as compared to MSBuild resolution)
       member tcConfig.SearchPathsForLibraryFiles = 
  
positive.code: 
      member tcConfig.MakePathAbsolute path = 
          let result = ComputeMakePathAbsolute tcConfig.implicitIncludeDir path
  #if TRACK_DOWN_EXTRA_BACKSLASHES        
          System.Diagnostics.Debug.Assert(not(result.Contains(@"\\")), "tcConfig.MakePathAbsolute results in a non-canonical filename with extra backslashes: "+result)
  #endif
          result
          
      member tcConfig.TryResolveLibWithDirectories (r:AssemblyReference) = 
          let m,nm = r.Range, r.Text
          use unwindBuildPhase = PushThreadBuildPhaseUntilUnwind (BuildPhase.Parameter)
  
negative.code:         let resolutions = TcAssemblyResolutions.Resolve(tcConfig,assemblyList,tcConfig.knownUnresolvedReferences)
          let frameworkDLLs,nonFrameworkReferences = resolutions.GetAssemblyResolutions() |> List.partition (fun r -> r.sysdir) 
          let unresolved = resolutions.GetUnresolvedReferences()
  #if DEBUG
          let itFailed = ref false
          let addedText = "\nIf you want to debug this right now, attach a debugger, and put a breakpoint in 'CompileOps.fs' near the text '!itFailed', and you can re-step through the assembly resolution logic."
  