get_backtrace    958 eval.c         	errat = get_backtrace(ruby_errinfo);
get_backtrace    3611 eval.c         	at = get_backtrace(mesg);
get_backtrace    5111 eval.c         		    errat = get_backtrace(ruby_errinfo);
get_backtrace    5913 eval.c             return get_backtrace(ruby_errinfo);
get_backtrace    8254 eval.c         	VALUE oldbt = get_backtrace(th->errinfo);