go121Events: convertOldFormat(tr),
		}, nil
	case version.Go122, version.Go123:
		return &Reader{
			r: br,
			order: ordering{
				mStates:     make(map[ThreadID]*mState),
				pStates:     make(map[ProcID]*pState),
				gStates:     make(map[GoID]*gState),
				activeTasks: make(map[TaskID]taskState),
			},
			// Don't emit a sync event when we first go to emit events.
			emittedSync: true,
		}, nil
	default:

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Test that a linkname applied on an assembly declaration
// does not affect stack map generation.

package main

import (
	"runtime"
	_ "unsafe"
)

//go:linkname asm
func asm(*int)

func main() {
	x := new(int)
	asm(x)
}

// called from asm
func callback() {

		os.Exit(exitCode)
	}

	sort.Sort(byDate(fixes))

	if *allowedRewrites != "" {
		allowed = make(map[string]bool)
		for _, f := range strings.Split(*allowedRewrites, ",") {
			allowed[f] = true
		}
	}

	if *forceRewrites != "" {
		force = make(map[string]bool)
		for _, f := range strings.Split(*forceRewrites, ",") {
			force[f] = true
		}
	}

	if flag.NArg() == 0 {

	false)

type stringSetFlag map[string]bool

func (ss *stringSetFlag) String() string {
	var items []string
	for item := range *ss {
		items = append(items, item)
	}
	sort.Strings(items)
	return strings.Join(items, ",")
}

func (ss *stringSetFlag) Set(s string) error {
	m := make(map[string]bool) // clobber previous value
	if s != "" {

//
//go:linkname cloneMultipartForm
func cloneMultipartForm(f *multipart.Form) *multipart.Form {
	if f == nil {
		return nil
	}
	f2 := &multipart.Form{
		Value: (map[string][]string)(Header(f.Value).Clone()),
	}
	if f.File != nil {
		m := make(map[string][]*multipart.FileHeader)
		for k, vv := range f.File {
			vv2 := make([]*multipart.FileHeader, len(vv))
			for i, v := range vv {
				vv2[i] = cloneMultipartFileHeader(v)

	f := findfunc(pc1)
	if !f.valid() {
		t.Fatalf("failed to resolve tiuTest at PC %#x", pc1)
	}

	want := map[string]int{
		"tiuInlined1:3 tiuTest:10":               0,
		"tiuInlined1:3 tiuInlined2:6 tiuTest:11": 0,
		"tiuInlined2:7 tiuTest:11":               0,
		"tiuTest:12":                             0,
	}
	wantStart := map[string]int{
		"tiuInlined1": 2,
		"tiuInlined2": 5,
		"tiuTest":     9,
	}

// creating complex traces that are mostly or completely correct.
func (t *Trace) Generation(gen uint64) *Generation {
	g := &Generation{
		trace:   t,
		gen:     gen,
		strings: make(map[string]uint64),
		stacks:  make(map[stack]uint64),
	}
	t.gens = append(t.gens, g)
	return g
}

// Generate creates a test file for the trace.
func (t *Trace) Generate() []byte {
	// Trace file contents.

	var fset token.FileSet
	f, err := parser.ParseFile(&fset, "./dwarf.go", nil, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}
	cm := ast.NewCommentMap(&fset, f, f.Comments)
	abbrevs := make(map[string]int)
	funcs := map[string]ast.Stmt{}
	for _, decl := range f.Decls {
		decl, ok := decl.(*ast.FuncDecl)
		if !ok || decl.Body == nil {
			continue
		}
		if decl.Name.Name == "putvar" || decl.Name.Name == "putAbstractVar" {

	id := rtcov.AddMeta(p, dlen, hash, pkgpath, pkgid, cmode, cgran)
	if id == 0 {
		throw("runtime.addCovMeta: coverage package map collision")
	}
	return id

		use121 = true
		httpmuxgo121.IncNonDefault()
	}
}

// serveMux121 holds the state of a ServeMux needed for Go 1.21 behavior.
type serveMux121 struct {
	mu    sync.RWMutex
	m     map[string]muxEntry
	es    []muxEntry // slice of entries sorted from longest to shortest.
	hosts bool       // whether any patterns contain hostnames
}

type muxEntry struct {
	h       Handler
	pattern string
}