anchor.diff:  open System.Diagnostics
   open System.Runtime.InteropServices
   open System.Composition
  +open System.ComponentModel.Composition
   open Microsoft.CodeAnalysis.Host.Mef
   open Microsoft.VisualStudio.Utilities
   
  
positive.code:             // TODO: Implement this for F#
              true 
  
  [<Shared>]
  [<ExportLanguageService(typeof<IEditorBraceCompletionSessionFactory>, FSharpConstants.FSharpLanguageName)>]
  type internal FSharpEditorBraceCompletionSessionFactory 
          [<ImportingConstructor>] (_smartIndetationService: ISmartIndentationService, _undoManager: ITextBufferUndoManagerProvider) =
      inherit ForegroundThreadAffinitizedObject ()
  
      member __.IsSupportedOpeningBrace openingBrace =
  
negative.code: 
              let textSnapshot = openingPoint.Snapshot
  
              let newSession =
                  match textSnapshot.GetOpenDocumentInCurrentContextWithChanges() with
                  | null -> null
                  | document ->
  