return fmt.Sprintf("types.NewStruct(%s)", i.fields(t.Fields, true))

	default:
		log.Fatalf("unhandled type: %#v", t)
		panic("unreachable")
	}
}

func (i *typeInterner) fields(fl *ast.FieldList, keepNames bool) string {
	if fl == nil || len(fl.List) == 0 {
		return "nil"
	}

	var res []string
	for _, f := range fl.List {
		typ := i.subtype(f.Type)
		if len(f.Names) == 0 {

func (p *parser) parseParameters(acceptTParams bool) (tparams, params *ast.FieldList) {
	if p.trace {
		defer un(trace(p, "Parameters"))
	}

	if acceptTParams && p.tok == token.LBRACK {
		opening := p.pos
		p.next()
		// [T any](params) syntax
		list := p.parseParameterList(nil, nil, token.RBRACK)
		rbrack := p.expect(token.RBRACK)
		tparams = &ast.FieldList{Opening: opening, List: list, Closing: rbrack}

			}
			return n.Pos()

		// types
		case *ArrayType:
			m = n.Elem
		case *SliceType:
			m = n.Elem
		case *DotsType:
			m = n.Elem
		case *StructType:
			if l := lastField(n.FieldList); l != nil {
				m = l
				continue
			}
			return n.Pos()
			// TODO(gri) need to take TagList into account
		case *Field:
			if n.Type != nil {
				m = n.Type
				continue
			}

	case *Ident:
		return t
	case *SelectorExpr:
		if _, ok := t.X.(*Ident); ok {
			return t.Sel
		}
	case *StarExpr:
		return fieldName(t.X)
	}
	return nil
}

func filterFieldList(fields *FieldList, filter Filter, export bool) (removedFields bool) {
	if fields == nil {
		return false
	}
	list := fields.List
	j := 0
	for _, f := range list {
		keepField := false
		if len(f.Names) == 0 {

			Walk(v, n.Doc)
		}
		walkList(v, n.Names)
		if n.Type != nil {
			Walk(v, n.Type)
		}
		if n.Tag != nil {
			Walk(v, n.Tag)
		}
		if n.Comment != nil {
			Walk(v, n.Comment)
		}

	case *FieldList:
		walkList(v, n.List)

	// Expressions
	case *BadExpr, *Ident, *BasicLit:
		// nothing to do

	case *Ellipsis:
		if n.Elt != nil {
			Walk(v, n.Elt)
		}

	case *FuncLit:
		Walk(v, n.Type)

// inadvertently copy a lock, by checking whether
// its receiver, parameters, or return values
// are locks.
func checkCopyLocksFunc(pass *analysis.Pass, name string, recv *ast.FieldList, typ *ast.FuncType) {
	if recv != nil && len(recv.List) > 0 {
		expr := recv.List[0].Type
		if path := lockPath(pass.Pkg, pass.TypesInfo.Types[expr].Type, nil); path != nil {

// be to pass typecheck a map from importpath to package API text
// (Go source code), but for now we use data structures (TypeConfig, Type).
//
// The strings mostly use gofmt form.
//
// A Field or FieldList has as its type a comma-separated list
// of the types of the fields. For example, the field list
//	x, y, z int
// has type "int, int, int".

// The prefix "type " is the type of a type.
// For example, given

	return namesSize+typeSize <= maxSize
}

func (p *printer) setLineComment(text string) {
	p.setComment(&ast.CommentGroup{List: []*ast.Comment{{Slash: token.NoPos, Text: text}}})
}

func (p *printer) fieldList(fields *ast.FieldList, isStruct, isIncomplete bool) {
	lbrace := fields.Opening
	list := fields.List
	rbrace := fields.Closing
	hasComments := isIncomplete || p.commentBefore(p.posFor(rbrace))

	r.order++
}

// fields returns a struct's fields or an interface's methods.
func fields(typ ast.Expr) (list []*ast.Field, isStruct bool) {
	var fields *ast.FieldList
	switch t := typ.(type) {
	case *ast.StructType:
		fields = t.Fields
		isStruct = true
	case *ast.InterfaceType:
		fields = t.Methods
	}
	if fields != nil {
		list = fields.List
	}
	return

	if tag != nil {
		for i := len(styp.FieldList) - len(styp.TagList); i > 0; i-- {
			styp.TagList = append(styp.TagList, nil)
		}
		styp.TagList = append(styp.TagList, tag)
	}

	f := new(Field)
	f.pos = pos
	f.Name = name
	f.Type = typ
	styp.FieldList = append(styp.FieldList, f)

	if debug && tag != nil && len(styp.FieldList) != len(styp.TagList) {