https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69785
--- Comment #6 from Matthias Klose <doko at gcc dot gnu.org> --- this one can be demangled: _ZN9__gnu_cxx13new_allocatorISt10_List_nodeISt4pairINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEENSt3tr18weak_ptrIN7libecap7adapter7ServiceEEEEEE9constructISG_JRKSF_EEEvPT_DpOT0_ it has _JRKSF_ instead of _IRKSF_