* </ul>
     *
     * @param spec string representation of a version or version range
     * @return a new {@link VersionRange} object that represents the spec
     * @throws InvalidVersionSpecificationException if invalid version specification
     */
    public static VersionRange createFromVersionSpec(String spec) throws InvalidVersionSpecificationException {

		if err != nil {
			logger.Fatal(fmt.Errorf("invalid arguments passed, trusted user certificate authority public key file is not parseable: %v", err), "unable to start SFTP server")
		}
	}

	// An SSH server is represented by a ServerConfig, which holds
	// certificate details and handles authentication of ServerConns.
	sshConfig := &ssh.ServerConfig{
		Config: ssh.Config{
			KeyExchanges: allowKexAlgos,
			Ciphers:      allowCiphers,

 * complete, some objects captured during the computation are closed.
 *
 * <p>A pipeline of {@code ClosingFuture}s is a tree of steps. Each step represents either an
 * asynchronously-computed intermediate value, or else an exception that indicates the failure or
 * cancellation of the operation so far. The only way to extract the value or exception from a step

below). 

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