SingletonImmutableSet(E element) {
    this.element = Preconditions.checkNotNull(element);
  }

  @Override
  public int size() {
    return 1;
  }

  @Override
  public boolean contains(@CheckForNull Object target) {
    return element.equals(target);
  }

  @Override
  public UnmodifiableIterator<E> iterator() {
    return singletonIterator(element);
  }

  @Override

	// below here are non-zero exit codes that don't indicate an error with istioctl itself
	ExitAnalyzerFoundIssues = 79 // istioctl analyze found issues, for CI/CD
)

func GetExitCode(e error) int {
	if strings.Contains(e.Error(), "unknown command") {
		e = util.CommandParseError{Err: e}
	}

	switch e.(type) {
	case util.CommandParseError:
		return ExitIncorrectUsage
	case analyze.FileParseError:
		return ExitDataError

    /**
     * charを含んでいるかどうか返します。
     *
     * @param str
     *            文字列
     * @param ch
     *            char
     * @return charを含んでいるかどうか
     */
    public static boolean contains(final String str, final char ch) {
        if (isEmpty(str)) {
            return false;
        }
        return str.indexOf(ch) >= 0;
    }

    /**
     * 文字列を含んでいるかどうか返します。
     *

    <class>
      <name>RepositoryBase</name>
      <version>1.0.0</version>
      <description><![CDATA[
         Repository contains the information needed
         for establishing connections with remote repository
      ]]></description>
      <fields>
        <field>
          <name>id</name>
          <version>1.0.0</version>

@ElementTypesAreNonnullByDefault
public abstract class ContiguousSet<C extends Comparable> extends ImmutableSortedSet<C> {
  /**
   * Returns a {@code ContiguousSet} containing the same values in the given domain {@linkplain
   * Range#contains contained} by the range.
   *
   * @throws IllegalArgumentException if neither range nor the domain has a lower bound, or if
   *     neither has an upper bound
   * @since 13.0
   */

            return "theDelegate";
          }
        };
    Executor sequential1 = newSequentialExecutor(delegate);
    Executor sequential2 = newSequentialExecutor(delegate);
    assertThat(sequential1.toString()).contains("theDelegate");
    assertThat(sequential1.toString()).isNotEqualTo(sequential2.toString());
    final String[] whileRunningToString = new String[1];
    sequential1.execute(
        new Runnable() {
          @Override

  // must contain a non-empty list.
  // +optional
  optional bool clusterScope = 4;

  // `namespaces` is a list of target namespaces that restricts
  // matches.  A request that specifies a target namespace matches
  // only if either (a) this list contains that target namespace or
  // (b) this list contains "*".  Note that "*" matches any

// Check if the given error corresponds to the specific ERROR_INVALID_HANDLE for windows
func isSysErrHandleInvalid(err error) bool {
	if runtime.GOOS != globalWindowsOSName {
		return false
	}
	// Check if err contains ERROR_INVALID_HANDLE errno
	var pathErr *os.PathError
	if errors.As(err, &pathErr) {
		var errno syscall.Errno
		if errors.As(pathErr.Err, &errno) {
			// ERROR_PATH_NOT_FOUND
			return errno == 0x6
		}

type HelpKV struct {
	Key         string `json:"key"`
	Type        string `json:"type"`
	Description string `json:"description"`
	Optional    bool   `json:"optional"`

	// Indicates if the value contains sensitive info that shouldn't be exposed
	// in certain apis (such as Health Diagnostics/Callhome)
	Sensitive bool `json:"-"`

	// Indicates if the value is a secret such as a password that shouldn't be

	if c.expectedOutput != "" && c.expectedOutput != output {
		t.Fatalf("Unexpected output for 'istioctl %s'\n got: %q\nwant: %q", strings.Join(c.args, " "), output, c.expectedOutput)
	}

	if c.expectedString != "" && !strings.Contains(output, c.expectedString) {
		t.Fatalf("Output didn't match for '%s %s'\n got %v\nwant: %v", cmd.Name(), strings.Join(c.args, " "), output, c.expectedString)
	}

	if c.wantException {
		if fErr == nil {