PERLVAR(Ttop_env, JMPENV *) /* ptr. to current sigjmp() environment */
PERLVAR(Tstart_env, JMPENV) /* empty startup sigjmp() environment */
PERLVARI(Tprotect, protect_proc_t, MEMBER_TO_FPTR(Perl_default_protect))
+PERLVARI(Terrors, SV *, Nullsv) /* outstanding queued errors */
/* statics "owned" by various functions */
PERLVAR(Tav_fetch_sv, SV *) /* owned by av_fetch() */