anchor.diff:  
     container.children.clear();
   
  -  var elements = new List.from((document.importNode(
  -          (querySelector('#$id') as TemplateElement).content, true)
  -      as DocumentFragment).children);
  +  var elements = new List.from((document.importNode((querySelector('#$id') as TemplateElement).content, true) as DocumentFragment).children);
     for (var element in elements) {
       container.append(element);
     }
  
positive.code:   _not get be => this;
    _not get to => this;
  
    get $null => T.expect(_exp.something,T.isNotNull);
  
    get ok => T.expect(_exp.something,T.isNull);
  
    equal(expected) => T.expect(_exp.something,T.isNot(expected));
  }
  
  _expect $expect(something) => new _expect(something);
  
  
  num parseFloat(String dimension) {
    return num.parse(dimension.replaceAll(new RegExp("[^0-9.]+"),""));
  }
  
  int parseInt(x, [_]) => parseFloat(x).floor();
  
negative.code:   await cb();
  }
  
  Future $async(cb, [delay = 1]) async {
    await wait(delay);
    return await cb();
  }
  