anchor.diff:  // TODO(turnidge): Rewrite HelpCommand so that it is a general utility
   // provided by the cli library.
   class HelpCommand extends DebuggerCommand {
  -  HelpCommand(Debugger debugger) : super(debugger, 'help', []);
  +  HelpCommand(Debugger debugger) : super(debugger, 'help', [
  +    new HelpHotkeysCommand(debugger),
  +  ]);
   
     String _nameAndAlias(Command cmd) {
       if (cmd.alias == null) {
  
positive.code:       return new Future.value(null);
      }
      try {
        debugger.currentFrame += count;
        debugger.console.print('frame = ${debugger.currentFrame}');
      } on RangeError catch (e) {
        debugger.console.print('frame must be in range [${e.start},${e.end-1}]');
  
negative.code:   }
  
    Future run(List<String> args) {
      debugger.resume();
    }
  
    String helpShort = 'Resume execution of the isolate (hotkey: [F7])';
  
    String helpLong =
        'Continue running the isolate.\n'
        '\n'
        'Hotkey: [F7]\n'
        '\n'
        'Syntax: continue\n'
        '        c\n';
  