rb_iseq_absolute_path 1003 iseq.c             return rb_iseq_absolute_path(iseqw_check(self));
rb_iseq_absolute_path  116 iseq.h         VALUE rb_iseq_absolute_path(const rb_iseq_t *iseq);
rb_iseq_absolute_path 1316 vm_backtrace.c     return iseq ? rb_iseq_absolute_path(iseq) : Qnil;