protected void write(DataOutputStream outputStream) throws Exception {
            outputStream.writeLong(nextBlock.getPos());
            outputStream.writeInt(largestInNextBlock);
            outputStream.writeInt(entries.size());
            for (FreeListEntry entry : entries) {
                outputStream.writeLong(entry.pos.getPos());
                outputStream.writeInt(entry.size);
            }
        }

func tcCompLit(n *ir.CompLitExpr) (res ir.Node) {
	if base.EnableTrace && base.Flag.LowerT {
		defer tracePrint("tcCompLit", n)(&res)
	}

	lno := base.Pos
	defer func() {
		base.Pos = lno
	}()

	ir.SetPos(n)

	t := n.Type()
	base.AssertfAt(t != nil, n.Pos(), "missing type in composite literal")

	switch t.Kind() {
	default:
		base.Errorf("invalid composite literal type %v", t)
		n.SetType(nil)

	"cmd/compile/internal/ir"
)

// The result of walkStmt MUST be assigned back to n, e.g.
//
//	n.Left = walkStmt(n.Left)
func walkStmt(n ir.Node) ir.Node {
	if n == nil {
		return n
	}

	ir.SetPos(n)

	walkStmtList(n.Init())

	switch n.Op() {
	default:
		if n.Op() == ir.ONAME {
			n := n.(*ir.Name)
			base.Errorf("%v is not a top level statement", n.Sym())
		} else {

		return true // discard
	}

	// Only worry about simple "l = r" assignments. The OAS2*
	// assignments mostly necessitate dynamic execution anyway.
	if len(lhs) > 1 {
		return false
	}

	lno := ir.SetPos(n)
	defer func() { base.Pos = lno }()

	nam := lhs[0].(*ir.Name)
	return s.StaticAssign(nam, 0, rhs, nam.Type())
}

// like staticassign but we are copying an already
// initialized value r.

		body.Append(ncase.Body...)
		if fall, pos := endsInFallthrough(ncase.Body); !fall {
			br := ir.NewBranchStmt(base.Pos, ir.OBREAK, nil)
			br.SetPos(pos)
			body.Append(br)
		}
	}
	sw.Cases = nil

	if defaultGoto == nil {
		br := ir.NewBranchStmt(base.Pos, ir.OBREAK, nil)
		br.SetPos(br.Pos().WithNotStmt())
		defaultGoto = br
	}

	s.Emit(&sw.Compiled)
	sw.Compiled.Append(defaultGoto)

func NewIdentifier(ident string) *IdentifierNode {
	return &IdentifierNode{NodeType: NodeIdentifier, Ident: ident}
}

// SetPos sets the position. [NewIdentifier] is a public method so we can't modify its signature.
// Chained for convenience.
// TODO: fix one day?
func (i *IdentifierNode) SetPos(pos Pos) *IdentifierNode {
	i.Pos = pos
	return i
}

  && setPos(v, x.Pos)
  && clobber(x)
  => (STMG2 [i-8] {s} p w0 w1 mem)
(MOVDstore [i] {s} p w2 x:(STMG2 [i-16] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(int64(i)-16)
  && setPos(v, x.Pos)
  && clobber(x)
  => (STMG3 [i-16] {s} p w0 w1 w2 mem)
(MOVDstore [i] {s} p w3 x:(STMG3 [i-24] {s} p w0 w1 w2 mem))
  && x.Uses == 1
  && is20Bit(int64(i)-24)
  && setPos(v, x.Pos)
  && clobber(x)

// described in the comment at the top of the file.
func order(fn *ir.Func) {
	if base.Flag.W > 1 {
		s := fmt.Sprintf("\nbefore order %v", fn.Sym())
		ir.DumpList(s, fn.Body)
	}
	ir.SetPos(fn) // Set reasonable position for instrumenting code. See issue 53688.
	orderBlock(&fn.Body, map[string][]*ir.Name{})
}

// append typechecks stmt and appends it to out.
func (o *orderState) append(stmt ir.Node) {

	}
	return n
}

// select
func tcSelect(sel *ir.SelectStmt) {
	var def *ir.CommClause
	lno := ir.SetPos(sel)
	Stmts(sel.Init())
	for _, ncase := range sel.Cases {
		if ncase.Comm == nil {
			// default
			if def != nil {

	//	ha, hit: hidden aggregate, iterator
	//	hn, hp: hidden len, pointer
	//	hb: hidden bool
	//	a, v1, v2: not hidden aggregate, val 1, 2

	a := nrange.X
	t := a.Type()
	lno := ir.SetPos(a)

	v1, v2 := nrange.Key, nrange.Value

	if ir.IsBlank(v2) {
		v2 = nil
	}

	if ir.IsBlank(v1) && v2 == nil {
		v1 = nil
	}

	if v1 == nil && v2 != nil {