box-cas!
vector-cas!
original commit: a416f68a7a02c777881f4848599deefb120d33ae
7.ss, scheme.1.in, comments of many files original commit: 06f858f9a505b9d6fb6ca1ac97234927cb2dc641
original commit: 47a210c15c63ba9677852269447bd2f2598b51fe