for i := 0; i < b.N; i++ {
		if _, err := ParseFile(token.NewFileSet(), "", src, ParseComments); err != nil {
			b.Fatalf("benchmark failed due to parse error: %s", err)
		}
	}
}

func BenchmarkParseOnly(b *testing.B) {
	b.SetBytes(int64(len(src)))
	for i := 0; i < b.N; i++ {
		if _, err := ParseFile(token.NewFileSet(), "", src, ParseComments|SkipObjectResolution); err != nil {
			b.Fatalf("benchmark failed due to parse error: %s", err)

	f1, err := parser.ParseFile(fset, "src", src, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}

	// pretty-print original
	var buf bytes.Buffer
	err = (&Config{Mode: UseSpaces | SourcePos, Tabwidth: 8}).Fprint(&buf, fset, f1)
	if err != nil {
		t.Fatal(err)
	}

	// parse pretty printed original
	// (//line directives must be interpreted even w/o parser.ParseComments set)

	for _, g := range list {
		buf.WriteString(g.Text())
	}
	return buf.String()
}

func TestCommentMap(t *testing.T) {
	fset := token.NewFileSet()
	f, err := parser.ParseFile(fset, "", src, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}
	cmap := NewCommentMap(fset, f, f.Comments)

	// very correct association of comments
	for n, list := range cmap {

func initialize() {
	const filename = "testdata/parser.go"

	src, err := os.ReadFile(filename)
	if err != nil {
		log.Fatalf("%s", err)
	}

	file, err := parser.ParseFile(fset, filename, src, parser.ParseComments)
	if err != nil {
		log.Fatalf("%s", err)
	}

	var buf bytes.Buffer
	testprint(&buf, file)
	if !bytes.Equal(buf.Bytes(), src) {
		log.Fatalf("print error: %s not idempotent", filename)
	}

	"d"
)`,
			want: []string{"a", "b", "c"},
		},
	} {
		t.Run(test.name, func(t *testing.T) {
			fset := token.NewFileSet()
			file, err := parser.ParseFile(fset, "test.go", strings.NewReader(test.in), parser.ParseComments)
			if err != nil {
				t.Fatal(err)
			}
			imps := findImportGroupStarts1(file.Imports)
			got := make([]string, len(imps))
			for i, imp := range imps {
				got[i], err = strconv.Unquote(imp.Path.Value)

		parserMode |= parser.AllErrors
	}
	if *printAST {
		sequential = true
	}
	if *printTrace {
		parserMode |= parser.Trace
		sequential = true
	}
	if *parseComments && (*printAST || *printTrace) {
		parserMode |= parser.ParseComments
	}
}

const usageString = `usage: gotype [flags] [path ...]

The gotype command, like the front-end of a Go compiler, parses and

	}
}

func TestNode(t *testing.T) {
	src, err := os.ReadFile(testfile)
	if err != nil {
		t.Fatal(err)
	}

	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, testfile, src, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}

	var buf bytes.Buffer

	if err = Node(&buf, fset, file); err != nil {
		t.Fatal("Node failed:", err)
	}

	diff(t, buf.Bytes(), src)
}

		}
		filter = func(fi fs.FileInfo) bool {
			return isGoFile(fi) && rx.MatchString(fi.Name())
		}
	}

	// get packages
	fset := token.NewFileSet()
	pkgs, err := parser.ParseDir(fset, dataDir, filter, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}

	// test packages
	for _, pkg := range pkgs {
		t.Run(pkg.Name, func(t *testing.T) {
			importPath := dataDir + "/" + pkg.Name
			var files []*ast.File

	nheadings := 0
	err := filepath.WalkDir(*root, func(path string, info fs.DirEntry, err error) error {
		if !info.IsDir() {
			return nil
		}
		pkgs, err := parser.ParseDir(fset, path, isGoFile, parser.ParseComments)
		if err != nil {
			if *verbose {
				fmt.Fprintln(os.Stderr, err)
			}
			return nil
		}
		for _, pkg := range pkgs {
			d := doc.New(pkg, path, doc.Mode(0))
			list := appendHeadings(nil, d.Doc)

	}
	for _, filename := range filenames {
		t.Run(strings.TrimSuffix(filepath.Base(filename), ".go"), func(t *testing.T) {
			fset := token.NewFileSet()
			astFile, err := parser.ParseFile(fset, filename, nil, parser.ParseComments)
			if err != nil {
				t.Fatal(err)
			}
			goldenFilename := strings.TrimSuffix(filename, ".go") + ".golden"
			archive, err := txtar.ParseFile(goldenFilename)
			if err != nil {
				t.Fatal(err)
			}