PERLVAR(Ibitcount, char *)
#ifdef USE_THREADS
-PERLVAR(Ithr_key, perl_key) /* For per-thread struct perl_thread* */
PERLVAR(Isv_mutex, perl_mutex) /* Mutex for allocating SVs in sv.c */
PERLVAR(Ieval_mutex, perl_mutex) /* Mutex for doeval */
PERLVAR(Ieval_cond, perl_cond) /* Condition variable for doeval */
#if defined(USE_ITHREADS)
PERLVAR(Iptr_table, PTR_TBL_t*)
#endif
+
+PERLVAR(Inullstash, HV *) /* illegal symbols end up here */