port_info         169 src/load.c         ScmObj port_info;
port_info         203 src/load.c             port_info = SCM_LIST2(p->prev_port,
port_info         206 src/load.c             port_info = SCM_LIST1(SCM_FALSE);
port_info         208 src/load.c         vm->load_history = Scm_Cons(port_info, vm->load_history);