f(func() { // 1,2
			if #state1 != abi.RF_READY { runtime.panicrangestate(#state1) }
			#state1 = abi.RF_PANIC
			var #state2 = abi.RF_READY
			g(func() { // 3,4
				if #state2 != abi.RF_READY { runtime.panicrangestate(#state2) }
				#state2 = abi.RF_PANIC
				var #state3 = abi.RF_READY
				h(func() { // 5,6
					if #state3 != abi.RF_READY { runtime.panicrangestate(#state3) }
					#state3 = abi.RF_PANIC
					...
					{

	{"runtime.panicdottypeI", 1},
	{"runtime.panicnildottype", 1},
	{"runtime.typeAssert", 1},
	{"runtime.interfaceSwitch", 1},
	{"runtime.ifaceeq", 1},
	{"runtime.efaceeq", 1},
	{"runtime.panicrangestate", 1},
	{"runtime.deferrangefunc", 1},
	{"runtime.rand32", 1},
	{"runtime.makemap64", 1},
	{"runtime.makemap", 1},
	{"runtime.makemap_small", 1},
	{"runtime.mapaccess1", 1},
	{"runtime.mapaccess1_fast32", 1},

// we only need to pass one.
func ifaceeq(tab *uintptr, x, y unsafe.Pointer) (ret bool)
func efaceeq(typ *uintptr, x, y unsafe.Pointer) (ret bool)

// panic for various rangefunc iterator errors
func panicrangestate(state int)

// defer in range over func
func deferrangefunc() interface{}

func rand32() uint32

// *byte is really *runtime.Type

	{"panicdottypeI", funcTag, 68},
	{"panicnildottype", funcTag, 69},
	{"typeAssert", funcTag, 67},
	{"interfaceSwitch", funcTag, 70},
	{"ifaceeq", funcTag, 72},
	{"efaceeq", funcTag, 72},
	{"panicrangestate", funcTag, 73},
	{"deferrangefunc", funcTag, 74},
	{"rand32", funcTag, 75},
	{"makemap64", funcTag, 77},
	{"makemap", funcTag, 78},
	{"makemap_small", funcTag, 79},
	{"mapaccess1", funcTag, 80},

//go:noinline
func panicrangestate(state int) {
	switch abi.RF_State(state) {
	case abi.RF_DONE:
		panic(rangeDoneError)
	case abi.RF_PANIC:
		panic(rangePanicError)
	case abi.RF_EXHAUSTED:
		panic(rangeExhaustedError)
	case abi.RF_MISSING_PANIC:
		panic(rangeMissingPanicError)
	}
	throw("unexpected state passed to panicrangestate")
}

						fn == "panicmakeslicelen" || fn == "panicmakeslicecap" || fn == "panicunsafeslicelen" ||
						fn == "panicunsafeslicenilptr" || fn == "panicunsafestringlen" || fn == "panicunsafestringnilptr" ||
						fn == "panicrangestate") {
				m := s.mem()
				b := s.endBlock()
				b.Kind = ssa.BlockExit
				b.SetControl(m)
				// TODO: never rewrite OPANIC to OCALLFUNC in the
				// first place. Need to wait until all backends