return "Unable to read file '" + file + "' due to: " + e.toString();
        }
    }

    public static void writeFile(String content, File destination) {
        writeFile(content, destination, Charset.defaultCharset().name());
    }

    public static void writeFile(String content, File destination, String encoding) {
        try {
            FileUtils.writeStringToFile(destination, content, encoding);

	if err := cgotest.OverlayDir(modRoot, "testdata"); err != nil {
		log.Panic(err)
	}
	if err := os.Chdir(modRoot); err != nil {
		log.Panic(err)
	}
	os.Setenv("PWD", modRoot)
	if err := os.WriteFile("go.mod", []byte("module cgostdio\n"), 0666); err != nil {
		log.Panic(err)
	}

	return m.Run()
}

// TestTestRun runs a cgo test that doesn't depend on non-standard libraries.
func TestTestRun(t *testing.T) {

	var buf bytes.Buffer

	fmt.Fprintf(&buf,
		"package %s; const _ = 0b%s // %d bits",
		name, strings.Repeat("1", length), length,
	)

	filename := filepath.Join(dir, fmt.Sprintf("%s.go", name))
	if err := os.WriteFile(filename, buf.Bytes(), 0666); err != nil {
		log.Fatal(err)
	}

	cmd := exec.Command("go", "tool", "compile", "-p=p", filename)
	cmd.Dir = dir
	output, err := cmd.CombinedOutput()

	if msg == "" {

  c <- 1
}
`

func main() {
	dir, err := ioutil.TempDir("", "21576")
	if err != nil {
		log.Fatal(err)
	}
	defer os.RemoveAll(dir)

	file := filepath.Join(dir, "main.go")
	if err := ioutil.WriteFile(file, []byte(prog), 0655); err != nil {
		log.Fatalf("Write error %v", err)
	}

	// Using a timeout of 1 minute in case other factors might slow
	// down the start of "go run". See https://golang.org/issue/34836.

		for _, goos := range gooses {
			value := 0
			if goos == target {
				value = 1
			}
			fmt.Fprintf(&buf, "const Is%s = %d\n", strings.Title(goos), value)
		}
		err := os.WriteFile("zgoos_"+target+".go", buf.Bytes(), 0666)
		if err != nil {
			log.Fatal(err)
		}
	}

	gen(buf, "ntz8tab", ntz8)
	gen(buf, "pop8tab", pop8)
	gen(buf, "rev8tab", rev8)
	gen(buf, "len8tab", len8)

	out, err := format.Source(buf.Bytes())
	if err != nil {
		log.Fatal(err)
	}

	err = os.WriteFile("bits_tables.go", out, 0666)
	if err != nil {
		log.Fatal(err)
	}
}

func gen(w io.Writer, name string, f func(uint8) uint8) {

	filename := filepath.Join(dir, basename)

	markdownBytes, err := os.ReadFile(filename)
	if err != nil {
		return err
	}

	processedMarkDown := processor(string(markdownBytes))

	return os.WriteFile(filename, []byte(processedMarkDown), 0644)
}

// cleanupForInclude parts of markdown that will make difficult to use it as include in the website:

    }

    static void unlockUncleanly(File target) {
        def lock = createDefaultFileLock(target)
        try {
            lock.writeFile {
                throw new AnException()
            }
        } catch (AnException e) {
            lock.close()
        }
        lock = createDefaultFileLock(target)
        try {

	defer chtmpdir(t)()
	const f = "append.txt"
	s := writeFile(t, f, O_CREATE|O_TRUNC|O_RDWR, "new")
	if s != "new" {
		t.Fatalf("writeFile: have %q want %q", s, "new")
	}
	s = writeFile(t, f, O_APPEND|O_RDWR, "|append")
	if s != "new|append" {
		t.Fatalf("writeFile: have %q want %q", s, "new|append")
	}
	s = writeFile(t, f, O_CREATE|O_APPEND|O_RDWR, "|append")
	if s != "new|append|append" {

            return "Unable to read file '" + file + "' due to: " + e.toString();
        }
    }

    public static void writeFile(String content, File destination) {
        writeFile(content, destination, Charset.defaultCharset().name());
    }

    public static void writeFile(String content, File destination, String encoding) {
        logDeprecation();
        try {