anchor.diff:          properties
               .add(js.Property(js.string("constructor"), classReference(cls)));
         }
  -
         properties.add(js.Property(_namer.operatorIs(cls.element), js.number(1)));
       }
   
  
positive.code: 
        'call0selector': js.quoteName(call0Name),
        'call1selector': js.quoteName(call1Name),
        'call2selector': js.quoteName(call2Name),
        'legacyJavaScript': _options.legacyJavaScript
      });
      if (program.hasSoftDeferredClasses) {
        mainCode = js.Block([
  
negative.code: // proto-property of the classes 'prototype' field.
  // Older IEs use `Object.create` and copy over the properties.
  function inherit(cls, sup) {
    // cls.prototype.constructor carries the cached RTI. We could avoid this by
    // using ES6 classes, but the side effects of this need to be tested.
    cls.prototype.constructor = cls;
    cls.prototype[#operatorIsPrefix + cls.name] = cls;
  
    // The superclass is only null for the Dart Object.
  