// First find the import spec.
	var importSpec *ast.ImportSpec
	walk(f, func(n any) {
		if importSpec != nil {
			return
		}
		spec, ok := n.(*ast.ImportSpec)
		if !ok {
			return
		}
		path, err := strconv.Unquote(spec.Path.Value)
		if err != nil {
			return
		}
		if path == "golang.org/x/tools/go/exact" {
			importSpec = spec
		}

	})
	if importSpec == nil {
		return false
	}

}

func importPath(s Spec) string {
	t, err := strconv.Unquote(s.(*ImportSpec).Path.Value)
	if err == nil {
		return t
	}
	return ""
}

func importName(s Spec) string {
	n := s.(*ImportSpec).Name
	if n == nil {
		return ""
	}
	return n.Name
}

func importComment(s Spec) string {
	c := s.(*ImportSpec).Comment
	if c == nil {
		return ""
	}
	return c.Text()
}

var res = map[string]string{
	" 5: *ast.File":       "the very first comment\npackage p\n",
	" 5: *ast.Ident":      " the name is p\n",
	" 8: *ast.GenDecl":    "imports\n",
	" 9: *ast.ImportSpec": "bytes\n",
	"10: *ast.ImportSpec": "fmt\n",
	"16: *ast.GenDecl":    "T\nalso associated with T\n",
	"17: *ast.Field":      "associated with a, b, c\n",
	"19: *ast.Field":      "associated with x, y\nfloat values\n",

pkg go/types, method (*Alias) String() string #63223
pkg go/types, method (*Alias) Underlying() Type #63223
pkg go/types, method (*Info) PkgNameOf(*ast.ImportSpec) *PkgName #62037
pkg go/types, method (Checker) PkgNameOf(*ast.ImportSpec) *PkgName #62037
pkg go/types, type Alias struct #63223
pkg go/types, type Info struct, FileVersions map[*ast.File]string #62605
pkg go/version, func Compare(string, string) int #62039

func (obj *Object) Pos() token.Pos {
	name := obj.Name
	switch d := obj.Decl.(type) {
	case *Field:
		for _, n := range d.Names {
			if n.Name == name {
				return n.Pos()
			}
		}
	case *ImportSpec:
		if d.Name != nil && d.Name.Name == name {
			return d.Name.Pos()
		}
		return d.Path.Pos()
	case *ValueSpec:
		for _, n := range d.Names {
			if n.Name == name {
				return n.Pos()
			}
		}

		return 1 << nFuncType
	case *ast.GenDecl:
		return 1 << nGenDecl
	case *ast.GoStmt:
		return 1 << nGoStmt
	case *ast.Ident:
		return 1 << nIdent
	case *ast.IfStmt:
		return 1 << nIfStmt
	case *ast.ImportSpec:
		return 1 << nImportSpec
	case *ast.IncDecStmt:
		return 1 << nIncDecStmt
	case *ast.IndexExpr:
		return 1 << nIndexExpr
	case *ast.IndexListExpr:
		return 1 << nIndexListExpr
	case *ast.InterfaceType:

			}
			fmt.Fprintf(w, "{%q, funcTag, %d},\n", decl.Name.Name, interner.intern(decl.Type))
		case *ast.GenDecl:
			if decl.Tok == token.IMPORT {
				if len(decl.Specs) != 1 || decl.Specs[0].(*ast.ImportSpec).Path.Value != "\"unsafe\"" {
					log.Fatal("runtime cannot import other package")
				}
				continue
			}
			if decl.Tok != token.VAR {
				log.Fatal("unhandled declaration kind", decl.Tok)
			}

	case *RangeStmt:
		if n.Key != nil {
			Walk(v, n.Key)
		}
		if n.Value != nil {
			Walk(v, n.Value)
		}
		Walk(v, n.X)
		Walk(v, n.Body)

	// Declarations
	case *ImportSpec:
		if n.Doc != nil {
			Walk(v, n.Doc)
		}
		if n.Name != nil {
			Walk(v, n.Name)
		}
		Walk(v, n.Path)
		if n.Comment != nil {
			Walk(v, n.Comment)
		}

	case *ValueSpec:

		r.filterType(nil, t.Key)
		r.filterType(nil, t.Value)
	case *ast.ChanType:
		r.filterType(nil, t.Value)
	}
}

func (r *reader) filterSpec(spec ast.Spec) bool {
	switch s := spec.(type) {
	case *ast.ImportSpec:
		// always keep imports so we can collect them
		return true
	case *ast.ValueSpec:
		s.Values = filterExprList(s.Values, token.IsExported, true)
		if len(s.Values) > 0 || s.Type == nil && len(s.Values) == 0 {