bool TransactionUnloader::unloadDeserializedDeclarations(Transaction* T,
                                                   DeclUnloader& DeclU) {
    //FIXME: Terrible hack, we *must* get rid of parseForModule by implementing
    // a header file generator in cling.
    bool Successful = true;
    for (Transaction::const_reverse_iterator I = T->deserialized_rdecls_begin(),
           E = T->deserialized_rdecls_end(); I != E; ++I) {
      const DeclGroupRef& DGR = (*I).m_DGR;
      for (DeclGroupRef::const_iterator
             Di = DGR.end() - 1, E = DGR.begin() - 1; Di != E; --Di) {
        // We only want to revert all that came through parseForModule, and
        // not the PCH.
        if (!(*Di)->isFromASTFile())
          Successful = DeclU.UnloadDecl(*Di) && Successful;
#ifndef NDEBUG
        assert(Successful && "Cannot handle that yet!");
#endif
      }
    }
    return Successful;
  }