anchor.diff:      Yarn (fun p ->
               { p with
                   WorkingDirectory = dir
  -                Command = Custom command 
  +                Command = Custom command
               })
   
   let currentDir = __SOURCE_DIRECTORY__
  
positive.code:     !! (destination </> "*.dll")
      |> Seq.iter(fun filename ->
          Rename (filename + ".txt") filename
      ) 
  )
  
  Target "Build.Fable" (fun _ ->
  
negative.code: open Fake.Testing.Expecto
  open Fake.YarnHelper
  
  let dotnetcliVersion = "2.0.2"
  
  let mutable dotnetExePath = "dotnet"
  let runDotnet dir =
  