anchor.diff:      /// <param name="fileversion">An integer that can be used to indicate the version of the file. This will be returned by TryGetRecentCheckResultsForFile when looking up the file.</param>
       /// <param name="source">The full source for the file.</param>
       /// <param name="options">The options for the project or script.</param>
  -    /// <param name="isResultObsolete">
  -    ///     A callback to check if a requested result is already obsolete, e.g. because of changed 
  -    //      source code in the editor. Type checking is abandoned when this returns 'true'.
  -    /// </param>
       /// <param name="textSnapshotInfo">
  -    ///     An item passed back to 'hasTextChangedSinceLastTypecheck' to help determine if 
  +    ///     An item passed back to 'hasTextChangedSinceLastTypecheck' (from some calls made on 'FSharpCheckFileResults') to help determine if 
       ///     an approximate intellisense resolution is inaccurate because a range of text has changed. This 
       ///     can be used to marginally increase accuracy of intellisense results in some situations.
       /// </param>
  
positive.code:     /// <param name="fileversion">An integer that can be used to indicate the version of the file. This will be returned by TryGetRecentCheckResultsForFile when looking up the file.</param>
      /// <param name="source">The full source for the file.</param>
      /// <param name="options">The options for the project or script.</param>
      /// <param name="isResultObsolete">
      ///     A callback to check if a requested result is already obsolete, e.g. because of changed 
      //      source code in the editor. Type checking is abandoned when this returns 'true'.
      /// </param>
      /// <param name="textSnapshotInfo">
      ///     An item passed back to 'hasTextChangedSinceLastTypecheck' to help determine if 
      ///     an approximate intellisense resolution is inaccurate because a range of text has changed. This 
      ///     can be used to marginally increase accuracy of intellisense results in some situations.
      /// </param>
  
negative.code:     /// </para>
      /// <para>
      ///   Return FSharpCheckFileAnswer.Aborted if a parse tree was not available or if the check
      ////  was abandoned due to some checkpoint during type checking.
      /// </para>
      /// </summary>
      ///
  