anchor.diff:                          finally e3.Dispose () }
   #endif
   
  +
  +
  +#if !FABLE_COMPILER
  +
   /// Additional operations on Task<'T>
   [<RequireQualifiedAccess>]
   module Task =
  
positive.code: 
      // http://msdn.microsoft.com/en-us/library/system.threading.tasks.task.whenall.aspx 
      #if !FABLE_COMPILER
      open System.Threading
      open System.Threading.Tasks
  
  
negative.code:     let tryFindSliceIndex (slice: _ list) (source: _ list) =
          let index = Internals.FindSliceIndex.listImpl slice source
          if index = -1 then None else Some index
      #endif
  
  
  /// Additional operations on Array
  