"anyOf": [{"type": "string"}, {"type": "integer"}]
                                },
                                "type": "array",
                                "title": "Location",
                            },
                            "msg": {"type": "string", "title": "Message"},
                            "type": {"type": "string", "title": "Error Type"},
                        },

  }

  /**
   * @see Predicates#containsPattern(String)
   */
  @GwtIncompatible // Only used by other GWT-incompatible code.
  private static final class ContainsPatternFromStringPredicate extends ContainsPatternPredicate {

    ContainsPatternFromStringPredicate(String string) {
      super(Platform.compilePattern(string));
    }

    @Override
    public String toString() {

	for resp := range stream.responses {
		errFatal(resp.Err)
		t.Logf("got resp: %+v", string(resp.Msg))
		if string(resp.Msg) != testPayload+strconv.Itoa(n) {
			t.Errorf("want %q, got %q", testPayload+strconv.Itoa(n), string(resp.Msg))
		}
		if n == 10 {
			close(stream.Requests)
			continue
		}
		n++
		t.Log("sending new client request")
		stream.Requests <- []byte(strconv.Itoa(n))
	}

| Action          | String  | Yes      | Value must be `AssumeRoleWithCustomToken`                         |
| Version         | String  | Yes      | Value must be `2011-06-15`                                           |
| Token           | String  | Yes      | Token to be authenticated by identity plugin                         |

	// string "Versions"
	o = append(o, 0xa8, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x73)
	o = msgp.AppendBytes(o, z.Versions)
	// string "SetIndex"
	o = append(o, 0xa8, 0x53, 0x65, 0x74, 0x49, 0x6e, 0x64, 0x65, 0x78)
	o = msgp.AppendInt(o, z.SetIndex)
	// string "PoolIndex"
	o = append(o, 0xa9, 0x50, 0x6f, 0x6f, 0x6c, 0x49, 0x6e, 0x64, 0x65, 0x78)
	o = msgp.AppendInt(o, z.PoolIndex)
	// string "Queued"

     */
    String getGroupId();

    /**
     * Gets the artifact id of the constituent's artifact.
     *
     * @return The artifact id, never {@code null}.
     */
    String getArtifactId();

    /**
     * Gets the type of the constituent's artifact.
     *
     * @return The type, never {@code null}.
     */
    String getType();

    /**

    private static final Logger logger = LogManager.getLogger(FileAuthentication.class);

    private FileConfig fileConfig;

    public String getId() {
        return asDocMeta().id();
    }

    public void setId(final String id) {
        asDocMeta().id(id);
    }

    public Long getVersionNo() {
        return asDocMeta().version();
    }

  private final TestByteSink byteSink;

  public TestCharSink(TestOption... options) {
    this.byteSink = new TestByteSink(options);
  }

  public String getString() {
    return new String(byteSink.getBytes(), UTF_8);
  }

  @Override
  public boolean wasStreamOpened() {
    return byteSink.wasStreamOpened();
  }

  @Override
  public boolean wasStreamClosed() {

  @Override
  protected Table<String, Integer, Character> create(@Nullable Object... data) {
    Supplier<TreeMap<Integer, Character>> factory =
        new Supplier<TreeMap<Integer, Character>>() {
          @Override
          public TreeMap<Integer, Character> get() {
            return Maps.newTreeMap();
          }
        };
    Map<String, Map<Integer, Character>> backingMap = new LinkedHashMap<>();

  private final TestByteSink byteSink;

  public TestCharSink(TestOption... options) {
    this.byteSink = new TestByteSink(options);
  }

  public String getString() {
    return new String(byteSink.getBytes(), UTF_8);
  }

  @Override
  public boolean wasStreamOpened() {
    return byteSink.wasStreamOpened();
  }

  @Override
  public boolean wasStreamClosed() {