// as for the packages transitively imported by the package(s) in pkgs.
//
// pkgs may include any package pattern that is valid to pass to 'go list',
// so it may also be a list of Go source files all in the same directory.
func WriteImportcfg(t testing.TB, dstPath string, packageFiles map[string]string, pkgs ...string) {
	t.Helper()

	icfg := new(bytes.Buffer)
	icfg.WriteString("# import config\n")

	// TODO(mdempsky): Consider using some non-nil pointer to indicate
	// the universe scope, so we don't need to keep re-reading it.
	if pkg := pr.pkgs[idx]; pkg != nil {
		return pkg
	}

	pkg := pr.newReader(pkgbits.RelocPkg, idx, pkgbits.SyncPkgDef).doPkg()
	pr.pkgs[idx] = pkg
	return pkg
}

func (r *reader) doPkg() *types.Package {
	path := r.String()
	switch path {
	case "":
		path = r.p.PkgPath()

// type-checks.
func (c *stdlibChecker) getDirPackage(dir string) (*Package, error) {
	c.mu.Lock()
	fut, ok := c.pkgs[dir]
	if !ok {
		// First request for this package dir; type check.
		fut = &futurePackage{
			done: make(chan struct{}),
		}
		c.pkgs[dir] = fut
		files, ok := c.dirFiles[dir]
		c.mu.Unlock()
		if !ok {
			fut.err = fmt.Errorf("no files for %s", dir)
		} else {

// type-checks.
func (c *stdlibChecker) getDirPackage(dir string) (*Package, error) {
	c.mu.Lock()
	fut, ok := c.pkgs[dir]
	if !ok {
		// First request for this package dir; type check.
		fut = &futurePackage{
			done: make(chan struct{}),
		}
		c.pkgs[dir] = fut
		files, ok := c.dirFiles[dir]
		c.mu.Unlock()
		if !ok {
			fut.err = fmt.Errorf("no files for %s", dir)
		} else {

		name := filepath.ToSlash(path[len(src):])
		if name == "builtin" || name == "cmd" {
			return filepath.SkipDir
		}

		pkgs = append(pkgs, strings.TrimPrefix(name, "vendor/"))
		return nil
	}
	if err := filepath.WalkDir(src, walkFn); err != nil {
		return nil, err
	}
	return pkgs, nil
}

func TestDependencies(t *testing.T) {
	if !testenv.HasSrc() {
		// Tests run in a limited file system and we do not

// name of the shared library containing it.
func TestShlibnameFiles(t *testing.T) {
	globalSkip(t)
	pkgs := append([]string{}, minpkgs...)
	pkgs = append(pkgs, "runtime/cgo")
	if runtime.GOARCH == "arm" {
		pkgs = append(pkgs, "math")
	}
	for _, pkg := range pkgs {
		shlibnamefile := filepath.Join(gorootInstallDir, pkg+".shlibname")
		contentsb, err := os.ReadFile(shlibnamefile)
		if err != nil {

	}
}

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
	}

	cmd.Stderr = &stderr
	out, err := cmd.Output()
	if err != nil {
		t.Fatalf("failed to run go list to determine stdlib packages: %v\nstderr:\n%v", err, stderr.String())
	}
	pkgs := strings.Fields(string(out))

	var nimports int
	for _, pkg := range pkgs {
		t.Run(pkg, func(t *testing.T) {
			if testPath(t, pkg, filepath.Join(testenv.GOROOT(t), "src", path.Dir(pkg))) != nil {
				nimports++
			}
		})
	}

			pkgs := packagePattern(m.Path)
			r.run(t, goBinCopy, "generate", `-run=^//go:generate bundle `, pkgs) // See issue 41409.
			advice := "$ cd " + m.Dir + "\n" +
				"$ go mod tidy                               # to remove extraneous dependencies\n" +
				"$ go mod vendor                             # to vendor dependencies\n" +

	}
	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)
	}
	if len(pkgs) > 1 {
		log.Fatalf("multiple packages in directory %s", pkg.Dir)
	}
	astPkg := pkgs[pkg.Name]