anchor.diff:     * @return the inherited executable element with the member name, or `null` if no such
      *         member exists
      */
  -  @deprecated
  +  @Deprecated('Use InheritanceManager2.getMember() instead.')
     ExecutableElement lookupMember(ClassElement classElt, String memberName) {
       ExecutableElement element = _lookupMemberInClass(classElt, memberName);
       if (element != null) {
  
positive.code:  * Instances of the class `InheritanceManager` manage the knowledge of where class members
   * (methods, getters & setters) are inherited from.
   */
  class InheritanceManager {
    /**
     * The [LibraryElement] that is managed by this manager.
  
negative.code:    * @return the inherited executable element with the member name, or `null` if no such
     *         member exists
     */
    @Deprecated('Use InheritanceManager2.getInherited() instead.')
    ExecutableElement lookupInheritance(
        ClassElement classElt, String memberName) {
      if (memberName == null || memberName.isEmpty) {
  