anchor.diff:  /// </summary>
   [<AllowNullLiteral>]
   type Context(runtime : IRuntime, resourceContextCount : int) =
  +    static let nopDisposable = { new IDisposable with member x.Dispose() = () }
       let resourceContexts = ContextHandle.createContexts resourceContextCount
       let resourceContextCount = resourceContexts.Length
   
  
positive.code:     member x.Release() = 
          isObtained <- false
          release x
          handle <- None
  
      member x.Obtain() = 
          handle <- Some <| obtain x
  
negative.code:                 // one obtaining/releasing the desired context.
                  new ContextToken (
                      ( fun x ->
                          handle.MakeCurrent()
                          currentToken.Value <- Some x
                          handle),
                      ( fun x ->
                          //handle.ReleaseCurrent()
                          //currentToken.Value <- None
                          ())
                  ) :> _
                      
      /// <summary>
  