* addSuppressed(Throwable) mechanism.
   */
  private static final Suppressor SUPPRESSING_SUPPRESSOR =
      (closeable, thrown, suppressed) -> {
        // ensure no exceptions from addSuppressed
        if (thrown == suppressed) {
          return;
        }
        try {
          thrown.addSuppressed(suppressed);
        } catch (Throwable e) {
          /*

   * addSuppressed(Throwable) mechanism.
   */
  private static final Suppressor SUPPRESSING_SUPPRESSOR =
      (closeable, thrown, suppressed) -> {
        // ensure no exceptions from addSuppressed
        if (thrown == suppressed) {
          return;
        }
        try {
          thrown.addSuppressed(suppressed);
        } catch (Throwable e) {
          /*

        catch ( IOException ioe ) {
            log.warn("sendrecv failed", ioe);
            try {
                disconnect(true);
            }
            catch ( IOException ioe2 ) {
                ioe.addSuppressed(ioe2);
                log.info("disconnect failed", ioe2);
            }
            throw ioe;
        }
        catch ( InterruptedException ie ) {
            throw new TransportException(ie);
        }

   */
  private void assertSuppressed(Suppression... expected) {
    assertEquals(ImmutableList.copyOf(expected), suppressor.suppressions);
  }

  // TODO(cpovirk): Just use addSuppressed+getSuppressed now that we can rely on it.
  /** Suppressor that records suppressions. */
  private static class TestSuppressor implements Closer.Suppressor {

   */
  private void assertSuppressed(Suppression... expected) {
    assertEquals(ImmutableList.copyOf(expected), suppressor.suppressions);
  }

  // TODO(cpovirk): Just use addSuppressed+getSuppressed now that we can rely on it.
  /** Suppressor that records suppressions. */
  private static class TestSuppressor implements Closer.Suppressor {

      throw failure
    }

    val unknownHostException = UnknownHostException(hostname)
    unknownHostException.initCause(failure)

    for (i in 1 until failures.size) {
      unknownHostException.addSuppressed(failures[i])
    }

    throw unknownHostException
  }

  private fun getCacheOnlyResponse(request: Request): Response? {
    if (client.cache != null) {
      try {

        val addresses = Dns.SYSTEM.lookup(hostname)
        listOf(addresses[0])
      }

    private operator fun Throwable?.plus(throwable: Throwable): Throwable {
      if (this != null) {
        addSuppressed(throwable)
        return this
      }
      return throwable
    }
  }

          }
        } catch (t: Throwable) {
          cancel()
          if (!signalledCallback) {
            val canceledException = IOException("canceled due to $t")
            canceledException.addSuppressed(t)
            responseCallback.onFailure(this@RealCall, canceledException)
          }
          throw t
        } finally {
          client.dispatcher.finished(this)
        }
      }
    }
  }

internal fun <E> MutableList<E>.addIfAbsent(element: E) {
  if (!contains(element)) add(element)
}

internal fun Exception.withSuppressed(suppressed: List<Exception>): Throwable =
  apply {
    for (e in suppressed) addSuppressed(e)
  }

internal inline fun <T> Iterable<T>.filterList(predicate: T.() -> Boolean): List<T> {
  var result: List<T> = emptyList()
  for (i in this) {
    if (predicate(i)) {

            try {
                transport.disconnect(true);
            }
            catch ( IOException e ) {
                log.warn("Failed to disconnect transport", e);
                se.addSuppressed(e);
            }
            throw se;
        }
    }


    /**
     * @param trans
     * @param sess
     * @throws CIFSException
     * 
     */