#error "FIXME: expair_needs_further_processing not yet implemented for hashtabs, sorry. A.F."
#endif // def EXPAIRSEQ_USE_HASHTAB
-GINAC_IMPLEMENT_REGISTERED_CLASS(expairseq, basic)
+GINAC_IMPLEMENT_REGISTERED_CLASS_NO_CTORS(expairseq, basic)
//////////
// helper classes