var errNoSuchGroup = errors.New("Specified group does not exist")

// error returned in IAM subsystem when a policy attach/detach request has no
// net effect, i.e. it is already applied.
var errNoPolicyToAttachOrDetach = errors.New("Specified policy update has no net effect")

// error returned in IAM subsystem when a non-empty group needs to be
// deleted.

 * @param <E> the element type
 */
public class SingleValueIterator<E> implements Iterator<E> {

    /** The only value returned by the iterator. */
    protected final E value;

    /** {@literal true} if the iterator has more elements. */
    protected boolean hasNext = true;

    /**
     * Returns an {@link Iterable} that wraps a {@link SingleValueIterator} for use in a for-each statement.
     *
     * @param <E> the element type

 * Defines the type of source files to compile, usually either the one that compose the output package
 * (i.e. the <i>main</i> artifact) or the ones that will be used when building <i>tests</i>).
 * <p>
 * This extensible enum has two defined values, {@link #MAIN} and {@link #TEST},
 * but can be extended by registering a {@code org.apache.maven.api.spi.ProjectScopeProvider}.
 * <p>

   * @throws NullPointerException if any element in the stream is {@code null}.
   * @return {@code Optional.of(onlyElement)} if the stream has exactly one element (must not be
   *     {@code null}) and returns {@code Optional.empty()} if it has none.
   */
  @SuppressWarnings("unchecked")
  public static <T> Collector<T, ?, Optional<T>> toOptional() {
    return (Collector) TO_OPTIONAL;
  }

     */
    @Override
    public void explicitlyActivate(String profileId) {
        if (!activatedIds.contains(profileId)) {
            logger.debug("Profile with id: '" + profileId + "' has been explicitly activated.");

            activatedIds.add(profileId);
        }
    }

    /* (non-Javadoc)
     * @see org.apache.maven.profiles.ProfileManager#explicitlyActivate(java.util.List)
     */

	if !ok {
		m = b.grow(len(s))
	}
	return copy(b.buf[m:], s), nil
}

// MinRead is the minimum slice size passed to a [Buffer.Read] call by
// [Buffer.ReadFrom]. As long as the [Buffer] has at least MinRead bytes beyond
// what is required to hold the contents of r, [Buffer.ReadFrom] will not grow the
// underlying buffer.
const MinRead = 512

                        }
                    }
                    return null;
                }
                if (this.isDataFromNodeStatus) {
                    /*
                     * 'this' has been updated and should now
                     * have a real NetBIOS name
                     */
                    this.calledName = null;
                    return getHostName();
                }

   *
   * For streaming requests with a body, headers must be prepared **before** the output stream has
   * been written to. Otherwise the body would need to be buffered!
   *
   * For non-streaming requests with a body, headers must be prepared **after** the output stream
   * has been written to and closed. This ensures that the `Content-Length` header field receives
   * the proper value.
   */

        assertNotNull(response);

        // Verify response has correct config
        Field configField = ServerMessageBlock2.class.getDeclaredField("config");
        configField.setAccessible(true);
        Configuration responseConfig = (Configuration) configField.get(response);
        assertEquals(mockConfig, responseConfig);

        // Verify response has correct fileId
        assertEquals(testFileId, response.getFileId());

   * @throws IllegalArgumentException if a valid {@link Inet4Address} can not be created
   */
  private static Inet4Address getInet4Address(byte[] bytes) {
    checkArgument(
        bytes.length == 4,
        "Byte array has invalid length for an IPv4 address: %s != 4.",
        bytes.length);

    // Given a 4-byte array, this cast should always succeed.
    return (Inet4Address) bytesToInetAddress(bytes, null);
  }

  /**