Program: 74532
Project: 74532
Buggy source:
private boolean _matchCompositeEntity(CompositeEntity patternEntity,CompositeEntity hostEntity){
  int matchSize=_match.size();
  boolean success=true;
  _match.put(patternEntity,hostEntity);
  if (patternEntity instanceof CompositeActor) {
    CompositeActor patternComposite=(CompositeActor)patternEntity;
    Director patternDirector=patternComposite.isOpaque() ? patternComposite.getDirector() : null;
    if (hostEntity instanceof CompositeActor) {
      CompositeActor hostComposite=(CompositeActor)hostEntity;
      Director hostDirector=hostComposite.isOpaque() ? hostComposite.getDirector() : null;
      success=_shallowMatchDirector(patternDirector,hostDirector);
    }
 else {
      success=false;
    }
  }
  if (success) {
    IndexedLists patternMarkedList=new IndexedLists();
    NamedObj patternNextActor=findFirstChild(patternEntity,patternMarkedList,_match.keySet());
    ObjectList patternList=new ObjectList();
    while (patternNextActor != null) {
      patternList.add(patternNextActor);
      patternNextActor=findNextChild(patternEntity,patternMarkedList,_match.keySet());
    }
    IndexedLists hostMarkedList=new IndexedLists();
    NamedObj hostNextActor=findFirstChild(hostEntity,hostMarkedList,_match.values());
    ObjectList hostList=new ObjectList();
    while (hostNextActor != null) {
      hostList.add(hostNextActor);
      hostNextActor=findNextChild(hostEntity,hostMarkedList,_match.values());
    }
    success=_matchObject(patternList,hostList);
  }
  if (!success) {
    _match.retain(matchSize);
  }
  return success;
}

Fixed version (ground truth):
private boolean _matchCompositeEntity(CompositeEntity patternEntity,CompositeEntity hostEntity){
  int matchSize=_match.size();
  boolean success=true;
  _match.put(patternEntity,hostEntity);
  Director patternDirector=null;
  Director hostDirector=null;
  if (patternEntity instanceof CompositeActor && ((CompositeActor)patternEntity).isOpaque()) {
    patternDirector=((CompositeActor)patternEntity).getDirector();
  }
  if (hostEntity instanceof CompositeActor && ((CompositeActor)hostEntity).isOpaque()) {
    hostDirector=((CompositeActor)hostEntity).getDirector();
  }
  if (patternDirector != null && hostDirector != null) {
    success=_shallowMatchDirector(patternDirector,hostDirector);
  }
 else   if (patternDirector != null) {
    success=false;
  }
  if (success) {
    IndexedLists patternMarkedList=new IndexedLists();
    NamedObj patternNextActor=findFirstChild(patternEntity,patternMarkedList,_match.keySet());
    ObjectList patternList=new ObjectList();
    while (patternNextActor != null) {
      patternList.add(patternNextActor);
      patternNextActor=findNextChild(patternEntity,patternMarkedList,_match.keySet());
    }
    IndexedLists hostMarkedList=new IndexedLists();
    NamedObj hostNextActor=findFirstChild(hostEntity,hostMarkedList,_match.values());
    ObjectList hostList=new ObjectList();
    while (hostNextActor != null) {
      hostList.add(hostNextActor);
      hostNextActor=findNextChild(hostEntity,hostMarkedList,_match.values());
    }
    success=_matchObject(patternList,hostList);
  }
  if (!success) {
    _match.retain(matchSize);
  }
  return success;
}