anchor.diff:    /// the console.
     final String library;
   
  -  /// A human-readable description of where the error was caught (as opposed to
  -  /// where it was thrown).
  -  ///
  -  /// The string should be in a form that will make sense in English when
  -  /// following the word "thrown", as in "thrown while obtaining the image from
  -  /// the network" (for the context "while obtaining the image from the
  -  /// network").
  +  /// A [DiagnosticsNode] that provides a human-readable description of where
  +  /// the error was caught (as opposed to where it was thrown).
  +  ///
  +  /// The node, e.g. an [ErrorDescription], should be in a form that will make
  +  /// sense in English when following the word "thrown", as in "thrown while
  +  /// obtaining the image from the network" (for the context "while obtaining
  +  /// the image from the network").
  +  ///
  +  /// {@tool snippet}
  +  /// This is an example of using and [ErrorDescription] as the
  +  /// [FlutterErrorDetails.context] when calling [FlutterError.reportError].
  +  ///
  +  /// ```dart
  +  /// void maybeDoSomething() {
  +  ///   try {
  +  ///     // Try to do something!
  +  ///   } catch (error) {
  +  ///     // Catch & report error.
  +  ///     FlutterError.reportError(FlutterErrorDetails(
  +  ///       exception: error,
  +  ///       library: 'Flutter test framework',
  +  ///       context: ErrorDescription('while dispatching notifications for $runtimeType'),
  +  ///     ));
  +  ///   }
  +  /// }
  +  /// ```
  +  /// {@end-tool}
  +  ///
  +  /// See also:
  +  ///
  +  ///  * [ErrorDescription], which provides an explanation of the problem and
  +  ///    its cause, any information that may help track down the problem,
  +  ///    background information, etc.
  +  ///  * [ErrorSummary], which provides a short (one line) description of the
  +  ///    problem that was detected.
  +  ///  * [ErrorHint], which provides specific, non-obvious advice that may be
  +  ///    applicable.
  +  ///  * [FlutterError], which is the most common place to use
  +  ///    [FlutterErrorDetails].
     final DiagnosticsNode context;
   
     /// A callback which filters the [stack] trace. Receives an iterable of
  
positive.code: import 'diagnostics.dart';
  import 'print.dart';
  import 'stack_frame.dart';
  
  /// Signature for [FlutterError.onError] handler.
  typedef FlutterExceptionHandler = void Function(FlutterErrorDetails details);
  
negative.code: 
  /// An [ErrorHint] provides specific, non-obvious advice that may be applicable.
  ///
  /// If your message provides obvious advice that is always applicable, it is an
  /// [ErrorDescription] not a hint.
  ///
  /// See also:
  