anchor.diff:        'Syntax: step\n';
   }
   
  -class AsyncStepCommand extends DebuggerCommand {
  -  AsyncStepCommand(Debugger debugger) : super(debugger, 'astep', []) {
  +class AsyncNextCommand extends DebuggerCommand {
  +  AsyncNextCommand(Debugger debugger) : super(debugger, 'anext', []) {
     }
   
     Future run(List<String> args) async {
  
positive.code:   }
  
    String helpShort =
        'Step into asynchronous continuation';
  
    String helpLong =
        'Continue running the isolate until control returns to the current '
        'activation of an async or async* function.\n'
        '\n'
        'Syntax: astep\n';
  }
  
  class FinishCommand extends DebuggerCommand {
  
negative.code:         new ContinueCommand(this),
          new NextCommand(this),
          new StepCommand(this),
          new AsyncNextCommand(this),
          new FinishCommand(this),
          new BreakCommand(this),
          new SetCommand(this),
  