rb_backtrace_to_str_ary  834 error.c        	obj = rb_backtrace_to_str_ary(obj);
rb_backtrace_to_str_ary   80 eval_error.c   	    bt = rb_backtrace_to_str_ary(bt);
rb_backtrace_to_str_ary 1509 internal.h     VALUE rb_backtrace_to_str_ary(VALUE obj);
rb_backtrace_to_str_ary  646 vm_backtrace.c     VALUE str = rb_backtrace_to_str_ary(self);