anchor.diff:      member this.GetRefMeta(path) =
           lock cachedRefMeta <| fun () ->
           match cachedRefMeta.TryGetValue path with
  -        | true, res -> res
  +        | true, (m, err, _) -> m, err
           | _ ->
               let mutable err = None
               let m = 
  
positive.code:                 else
                  try
                      let compilation = endCtx.Compilation :?> CSharpCompilation
  
                      let compiler = WebSharper.Compiler.CSharp.WebSharperCSharpCompiler(ignore)
  
  
negative.code:             watcher.Renamed |> Event.add onChange
              watcher.Deleted |> Event.add onChange
  
              cachedRefMeta.Add(path, (m, err, watcher))    
              m, err        
  
      interface IDisposable with
          member this.Dispose() =
              lock cachedRefMeta <| fun () ->
                  for _, _, watcher in cachedRefMeta.Values do
                      watcher.Dispose()
                  cachedRefMeta.Clear()
  
      override this.SupportedDiagnostics =
          ImmutableArray.Create(wsWarning, wsError)
  