/*
func dump(msg string, val reflect.Value) {
	fmt.Printf("%s:\n", msg)
	ast.Print(fileSet, val.Interface())
	fmt.Println()
}
*/

// rewriteFile applies the rewrite rule 'pattern -> replace' to an entire file.
func rewriteFile(fileSet *token.FileSet, pattern, replace ast.Expr, p *ast.File) *ast.File {
	cmap := ast.NewCommentMap(fileSet, p, p.Comments)
	m := make(map[string]reflect.Value)

			}
		case scanner.EOF:
			return ""
		}
	}

	return ""
}

func runTest(t *testing.T, in, out string) {
	// process flags
	*simplifyAST = false
	*rewriteRule = ""
	info, err := os.Lstat(in)
	if err != nil {
		t.Error(err)
		return
	}
	for _, flag := range strings.Split(gofmtFlags(in, 20), " ") {
		elts := strings.SplitN(flag, "=", 2)
		name := elts[0]

)

var (
	// main operation modes
	list        = flag.Bool("l", false, "list files whose formatting differs from gofmt's")
	write       = flag.Bool("w", false, "write result to (source) file instead of stdout")
	rewriteRule = flag.String("r", "", "rewrite rule (e.g., 'a[b:len(a)] -> a[b:]')")
	simplifyAST = flag.Bool("s", false, "simplify code")
	doDiff      = flag.Bool("d", false, "display diffs instead of rewriting files")