eval_string      1445 vm_eval.c          return eval_string(self, src, scope, file, line);
eval_string      1453 vm_eval.c          return eval_string(rb_vm_top_self(), rb_str_new2(str), Qnil, file, 1);
eval_string      1465 vm_eval.c          return eval_string(rb_vm_top_self(), arg->str, Qnil, arg->filename, 1);
eval_string      1579 vm_eval.c      	val = eval_string(rb_vm_top_self(), cmd, Qnil, 0, 0);