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