}

func (w walker) node(n Node) {
	if n == nil {
		panic("nil node")
	}

	w.v = w.v.Visit(n)
	if w.v == nil {
		return
	}

	switch n := n.(type) {
	// packages
	case *File:
		w.node(n.PkgName)
		w.declList(n.DeclList)

	// declarations
	case *ImportDecl:
		if n.LocalPkgName != nil {
			w.node(n.LocalPkgName)
		}
		w.node(n.Path)

	case *ConstDecl:
		w.nameList(n.NameList)

	fmtTypeID
	fmtTypeIDName
)

// Sym

// Format implements formatting for a Sym.
// The valid formats are:
//
//	%v	Go syntax: Name for symbols in the local package, PkgName.Name for imported symbols.
//	%+v	Debug syntax: always include PkgName. prefix even for local names.
//	%S	Short syntax: Name only, no matter what.
func (s *Sym) Format(f fmt.State, verb rune) {
	mode := fmtGo
	switch verb {
	case 'v', 'S':

		c = ir.NewSelectorExpr(base.Pos, ir.ODOT, c, lname("data"))
		setField("name", c, i)

		// Set the name of package being compiled as a unique identifier of a module.
		// asanModulename = pkgName + "\000"
		init.Append(typecheck.Stmt(ir.NewAssignStmt(base.Pos, asanModulename, ir.NewString(base.Pos, types.LocalPkg.Name+"\000"))))
		c = tconv(typecheck.NodAddr(asanModulename), types.Types[types.TUNSAFEPTR])

	incfg := filepath.Join(outdir, tag+"incfg.txt")
	outcfg := filepath.Join(outdir, "outcfg.txt")
	p := covcmd.CoverPkgConfig{
		PkgPath:      ppath,
		PkgName:      pname,
		Granularity:  gran,
		OutConfig:    outcfg,
		EmitMetaFile: mpath,
	}
	data, err := json.Marshal(p)
	if err != nil {
		t.Fatalf("json.Marshal failed: %v", err)
	}
	writeFile(t, incfg, data)

		}
	}
	return conf.Check(f.PkgName.Value, []*syntax.File{f}, info)
}

func mustTypecheck(src string, conf *Config, info *Info) *Package {
	pkg, err := typecheck(src, conf, info)
	if err != nil {
		panic(err) // so we don't need to pass *testing.T
	}
	return pkg
}

// pkgName extracts the package name from src, which must contain a package header.
func pkgName(src string) string {
	const kw = "package "

func TestIssue65898(t *testing.T) {
	const src = `
package p
func _[A any](A) {}
`

	fset := token.NewFileSet()
	f := mustParse(fset, src)

	var conf types.Config
	pkg, err := conf.Check(pkgName(src), fset, []*ast.File{f}, nil)
	if err != nil {
		t.Fatal(err)
	}

	for _, d := range f.Decls {
		if fun, _ := d.(*ast.FuncDecl); fun != nil {

	f.fn.counterVar = ""
}

func annotate(names []string) {
	var p *Package
	if *pkgcfg != "" {
		pp := pkgconfig.PkgPath
		pn := pkgconfig.PkgName
		mp := pkgconfig.ModulePath
		mdb, err := encodemeta.NewCoverageMetaDataBuilder(pp, pn, mp)
		if err != nil {
			log.Fatalf("creating coverage meta-data builder: %v\n", err)
		}
		p = &Package{
			mdb: mdb,

			// that was type-checked directly.
			compile(t, rootDir, entry.Name(), filepath.Join(tmpdir, "testdata"), nil, filename)
			pkgName := strings.TrimSuffix(entry.Name(), ".go")
			imported := importPkg(t, "./testdata/"+pkgName, tmpdir)
			checked := checkFile(t, filename, src)

			seen := make(map[string]bool)
			for _, name := range imported.Scope().Names() {
				if !token.IsExported(name) {

	versions      map[*ast.File]string      // maps files to version strings (each file has an entry); shared with Info.FileVersions if present
	imports       []*PkgName                // list of imported packages
	dotImportMap  map[dotImportKey]*PkgName // maps dot-imported objects to the package they were dot-imported through
	recvTParamMap map[*ast.Ident]*TypeParam // maps blank receiver type parameters to their type

// meta-data blob, e.g. the coverage meta-data payload
// computed for a given Go package.
type MetaSymbolHeader struct {
	Length     uint32 // size of meta-symbol payload in bytes
	PkgName    uint32 // string table index
	PkgPath    uint32 // string table index
	ModulePath uint32 // string table index
	MetaHash   [16]byte
	_          byte    // currently unused
	_          [3]byte // padding