walkDir(path)
		default:
			if err := processFile(path, false); err != nil {
				report(err)
			}
		}
	}

	os.Exit(exitCode)
}

const parserMode = parser.ParseComments

func gofmtFile(f *ast.File) ([]byte, error) {
	var buf bytes.Buffer
	if err := format.Node(&buf, fset, f); err != nil {
		return nil, err
	}
	return buf.Bytes(), nil
}

	file, err := parser.ParseFile(fset, desc, in, parserMode)
	if err != nil {
		t.Errorf("parsing: %v", err)
		return
	}

	outb, err := gofmtFile(file)
	if err != nil {
		t.Errorf("printing: %v", err)
		return
	}
	if s := string(outb); in != s && mustBeGofmt {
		t.Errorf("not gofmt-formatted.\n--- %s\n%s\n--- %s | gofmt\n%s",
			desc, in, desc, s)

	cfg.External = map[string]string{}
	cfg1.External = cfg.External
	if imports(f, "C") {
		// Run cgo on gofmtFile(f)
		// Parse, extract decls from _cgo_gotypes.go
		// Map _Ctype_* types to C.* types.
		err := func() error {
			txt, err := gofmtFile(f)
			if err != nil {
				return err
			}
			dir, err := os.MkdirTemp(os.TempDir(), "fix_cgo_typecheck")
			if err != nil {