anchor.diff:          .SourcesFromProject()
           .References(fun r ->
               [
  -                r.NuGet("IntelliFactory.Reactive").Reference()
  +                r.NuGet("IntelliFactory.Reactive").ForceFoundVersion().Reference()
  +                r.NuGet("WebSharper.Html").ForceFoundVersion().Reference()
               ])
   
   let test =
  
positive.code:         .References(fun r ->
              [
                  r.NuGet("IntelliFactory.Reactive").Reference()
                  r.Project(main)
              ])
  
  
negative.code: let bt =
      BuildTool().PackageId("WebSharper.Piglets")
          .VersionFrom("WebSharper")
          .WithFSharpVersion(FSharpVersion.FSharp30)
          .WithFramework(fun fw -> fw.Net40)
  
  let main =
  