{{if .Maybe}}
	case <-dummy:
		panic("dummy receive")
	{{end}}
	{{/*  Nil channel send, receive to keep compiler from optimizing select. */}}
	{{if .Maybe}}
	case nilch <- 1:
		panic("nilch send")
	{{end}}
	{{if .Maybe}}
	case <-nilch:
		panic("nilch recv")
	{{end}}
	}
	{{end}}
	if x != n {
		die(x)
	}
	n++
`)

var recvOrder = parse("recvOrder", `

	if len(fieldSelector) == 0 {
		return nil
	}

	terms := make([]string, 0, 1)
	startIndex := 0
	inSlash := false
	for i, c := range fieldSelector {
		switch {
		case inSlash:
			inSlash = false
		case c == '\\':
			inSlash = true
		case c == ',':
			terms = append(terms, fieldSelector[startIndex:i])
			startIndex = i + 1
		}
	}

	BYTE $0xB9; BYTE $0x17; BYTE $0x00; BYTE $0x22                         // llgtr 2,2
	BYTE $0xA5; BYTE $0x26; BYTE $0x7F; BYTE $0xFF                         // nilh  2,32767
	BYTE $0xE3; BYTE $0x22; BYTE $0x00; BYTE $0x58; BYTE $0x00; BYTE $0x04 // lg    2,88(2)
	BYTE $0xE3; BYTE $0x22; BYTE $0x00; BYTE $0x08; BYTE $0x00; BYTE $0x04 // lg    2,8(2)

	dumpint(uint64(uintptr(unsafe.Pointer(gp._panic))))

	// dump stack
	var child childInfo
	child.args.n = -1
	child.arglen = 0
	child.sp = nil
	child.depth = 0
	var u unwinder
	for u.initAt(pc, sp, lr, gp, 0); u.valid(); u.next() {
		dumpframe(&u.frame, &child)
	}

	// dump defer & panic records
	for d := gp._defer; d != nil; d = d.link {
		dumpint(tagDefer)

	if p.lr == 0 {
		return false
	}

	gp := getg()
	systemstack(func() {
		var limit uintptr
		if d := gp._defer; d != nil {
			limit = d.sp
		}

		var u unwinder
		u.initAt(p.lr, uintptr(p.fp), 0, gp, 0)
		for {
			if !u.valid() {
				p.lr = 0
				return // ok == false
			}

			// TODO(mdempsky): If we populate u.frame.fn.deferreturn for

		}
	}
	return gp.m.lockedExt, gp.m.lockedInt
}

//go:noinline
func TracebackSystemstack(stk []uintptr, i int) int {
	if i == 0 {
		pc, sp := getcallerpc(), getcallersp()
		var u unwinder
		u.initAt(pc, sp, 0, getg(), unwindJumpStack) // Don't ignore errors, for testing
		return tracebackPCs(&u, 0, stk)
	}
	n := 0
	systemstack(func() {
		n = TracebackSystemstack(stk, i-1)
	})
	return n
}