anchor.diff:  abstract class InstanceMirror implements ObjectMirror {
     /**
      * A mirror on the type of the reflectee.
  +   *
  +   * Returns a mirror on the actual class of the reflectee.
  +   * The class of the reflectee may differ from
  +   * the object returned by invoking [runtimeType] on
  +   * the reflectee.
      */
     ClassMirror get type;
   
  
positive.code:    * Invokes a getter and returns a mirror on the result. The getter
     * can be the implicit getter for a field or a user-defined getter
     * method.
     */
    /* TODO(turnidge): Handle ambiguous names.*/
    InstanceMirror getField(Symbol fieldName);
  
negative.code: 
    /**
     * Perform [invocation] on [reflectee].
     * Equivalent to
     *
     * this.invoke(invocation.memberName,
     *             invocation.positionalArguments,
     *             invocation.namedArguments);
     */
    delegate(Invocation invocation);
  }
  