anchor.diff:      static let expectedExitCode = 0
       static let runsOnMono = try System.Type.GetType("Mono.Runtime") <> null with _ -> false
   
  -    let verifierPath, switches =
  +    let verifierInfo =
           if runsOnMono then
  -            "pedump", "--verify all"
  +            Some ("pedump", "--verify all")
           else
               let rec tryFindFile (fileName : string) (dir : DirectoryInfo) =
                   let file = Path.Combine(dir.FullName, fileName)
  
positive.code:                 if dI.Exists then Some dI
                  else None
  
              match Array.tryPick tryGetSdkDir [| Environment.SpecialFolder.ProgramFiles ; Environment.SpecialFolder.ProgramFilesX86 |] with
              | None -> failwith "Could not resolve .NET SDK folder."
              | Some sdkDir ->
                  match tryFindFile "peverify.exe" sdkDir with
                  | None -> failwith "Could not locate 'peverify.exe'."
                  | Some pe -> pe, "/UNIQUE /IL /NOLOGO"
  
      static let execute (fileName : string, arguments : string) =
          printfn "executing '%s' with arguments %s" fileName arguments
  
negative.code:                 else
                      dir.GetDirectories() 
                      |> Array.sortBy(fun d -> d.Name)
                      |> Array.filter(fun d -> 
                          match d.Name with 
                          // skip old SDK directories
                          | "v6.0" | "v6.0A" | "v7.0" | "v7.0A" | "v7.1" | "v7.1A" -> false
                          | _ -> true)
                      |> Array.rev // order by descending -- get latest version
                      |> Array.tryPick (tryFindFile fileName)
  
  