extern StgWeak * RTS_VAR(old_weak_ptr_list);
extern StgWeak * RTS_VAR(weak_ptr_list);
extern StgClosure * RTS_VAR(caf_list);
extern StgClosure * RTS_VAR(revertible_caf_list);
extern StgTSO * RTS_VAR(resurrected_threads);
extern StgWeak * RTS_VAR(old_weak_ptr_list);
extern StgWeak * RTS_VAR(weak_ptr_list);
extern StgClosure * RTS_VAR(caf_list);
extern StgClosure * RTS_VAR(revertible_caf_list);
extern StgTSO * RTS_VAR(resurrected_threads);