flag.Parse()
	fset := token.NewFileSet()
	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))

	}
}

func TestParseDir(t *testing.T) {
	path := "."
	pkgs, err := ParseDir(token.NewFileSet(), path, dirFilter, 0)
	if err != nil {
		t.Fatalf("ParseDir(%s): %v", path, err)
	}
	if n := len(pkgs); n != 1 {
		t.Errorf("got %d packages; want 1", n)
	}
	pkg := pkgs["parser"]
	if pkg == nil {
		t.Errorf(`package "parser" not found`)
		return
	}
	if n := len(pkg.Files); n != 3 {

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This file contains the exported entry points for invoking the parser.

package parser

import (
	"bytes"
	"errors"
	"go/ast"
	"go/token"
	"io"
	"io/fs"
	"os"
	"path/filepath"
	"strings"
)

// If src != nil, readSource converts src to a []byte if possible;

	}
	return v
}

func loadTypes(path, pkgName string, v visitor) {
	fset := token.NewFileSet()

	filter := func(fi fs.FileInfo) bool {
		return strings.HasSuffix(fi.Name(), ".go")
	}
	pkgs, err := parser.ParseDir(fset, path, filter, 0)
	if err != nil {
		panic(err)
	}

	pkg := pkgs[pkgName]

	for _, f := range pkg.Files {
		ast.Walk(v, f)
	}
}

func TestMirrorWithReflect(t *testing.T) {

// license that can be found in the LICENSE file.

package doc

import (
	"bytes"
	"go/parser"
	"go/token"
	"internal/diff"
	"testing"
)

func TestComment(t *testing.T) {
	fset := token.NewFileSet()
	pkgs, err := parser.ParseDir(fset, "testdata/pkgdoc", nil, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}
	if pkgs["pkgdoc"] == nil {
		t.Fatal("missing package pkgdoc")
	}

	errorCount = 0
	sequential = false
	parserMode parser.Mode
)

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

func (a *analyzer) collect(dir string) {
	if _, ok := a.donePaths[dir]; ok {
		return
	}
	a.donePaths[dir] = nil

	// Create the AST by parsing src.
	fs, err := parser.ParseDir(a.fset, dir, nil, parser.AllErrors|parser.ParseComments)

	if err != nil {
		fmt.Fprintln(os.Stderr, "ERROR(syntax)", logPrefix, err)
		a.failed = true
		return
	}

	for _, p := range fs {

	// that the tables used by the code above are exhaustive.

	// Parse the whole runtime package, checking that arguments of
	// appropriate atomic operations are in the list above.
	fset := token.NewFileSet()
	m, err := parser.ParseDir(fset, ".", nil, 0)
	if err != nil {
		t.Fatalf("parsing runtime failed: %v", err)
	}
	pkg := m["runtime"] // Note: ignore runtime_test and main packages

			t.Fatal(err)
		}
		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

			}
		}
		for _, name := range pkg.CgoFiles {
			if name == info.Name() {
				return true
			}
		}
		return false
	}
	fset := token.NewFileSet()
	pkgs, err := parser.ParseDir(fset, pkg.Dir, include, parser.ParseComments)
	if err != nil {
		log.Fatal(err)
	}
	// Make sure they are all in one package.
	if len(pkgs) == 0 {
		log.Fatalf("no source-code package in directory %s", pkg.Dir)
	}