anchor.diff:  
   "Clean"
     ==> "AssemblyInfo"
  +  =?> ("MSBuildRestore", not isMono)
     ==> "Build"
     <=> "BuildCore"
     ==> "RunTests"
  
positive.code: // --------------------------------------------------------------------------------------
  // Build library & test project
  
   Target "Build" (fun _ ->
      if isMono then
          !! solutionFile
          |> MSBuildReleaseExt "" [
  
negative.code:         !! solutionFile
          |> MSBuildReleaseExt "" [] "Rebuild"
          |> ignore
  )
  
  let assertExitCodeZero x = 
      if x = 0 then () else 
  