* </pre>
   *
   * @throws IllegalArgumentException if there is a loop in the causal chain
   */
  public static Throwable getRootCause(Throwable throwable) {
    // Keep a second pointer that slowly walks the causal chain. If the fast pointer ever catches
    // the slower pointer, then there's a loop.
    Throwable slowPointer = throwable;
    boolean advanceSlowPointer = false;

    void throwsSmbExceptionFromFilter() {
        SmbFilenameFilter filter = (dir, name) -> {
            throw new SmbException("boom");
        };

        SmbException ex = assertThrows(SmbException.class, () -> filter.accept(mockDir, "x"));
        assertEquals("boom", ex.getMessage(), "Exception message should be preserved");
        verifyNoInteractions(mockDir);
    }

    /**

                removeWaiter(node);
                break long_wait_loop; // jump down to the busy wait loop
              }
            }
          }
          oldHead = waitersField; // re-read and loop.
        } while (oldHead != Waiter.TOMBSTONE);
      }
      // re-read valueField, if we get here then we must have observed a TOMBSTONE while trying to

       * to test it.
       */
      return;
    }

    /*
     * Only under Windows (or hypothetically when running with some other non-POSIX, ACL-based
     * filesystem) does our prod code look up the username. Thus, this test doesn't necessarily test
     * anything interesting under most environments. Still, we can run it (except for Android, at

setting [Transport.DisableKeepAlives] to `true` will disable connection reuse.
However, such performance degradation usually indicates improper configuration
or usage of [Transport] or [Client] in the first place, and a deeper look would

/// tip | Подсказка

Если вы столкнулись с `RuntimeError: Task attached to a different loop` при вызове асинхронных функций в ваших тестах (например, при использовании [MongoDB's MotorClient](https://stackoverflow.com/questions/41584243/runtimeerror-task-attached-to-a-different-loop)), то не забывайте создавать экземпляры объектов, которым нужен цикл событий (event loop), только внутри асинхронных функций, например, в `@app.on_event("startup")` callback.

  var maxStaleSeconds = -1
  var minFreshSeconds = -1
  var onlyIfCached = false
  var noTransform = false
  var immutable = false

  var canUseHeaderValue = true
  var headerValue: String? = null

  loop@ for (i in 0 until headers.size) {
    val name = headers.name(i)
    val value = headers.value(i)

    when {
      name.equals("Cache-Control", ignoreCase = true) -> {
        if (headerValue != null) {

			}
		}
		quorum := len(perPoolErrs) / 2
		poolErrs = append(poolErrs, reduceWriteQuorumErrs(ctx, perPoolErrs, bucketOpIgnoredErrs, quorum))
	}

	if !opts.Recreate {
		// when there is no force recreate look for pool
		// errors to recreate the bucket on all pools.
		opts.Remove = isAllBucketsNotFound(poolErrs)
		opts.Recreate = !opts.Remove
	}

	g = errgroup.WithNErrs(len(sys.peerClients))

   * exception goes to the uncaught exception handler.
   */
  private fun interceptorThrowsRuntimeExceptionAsynchronous(network: Boolean) {
    val boom = RuntimeException("boom!")
    addInterceptor(network) { chain: Interceptor.Chain? -> throw boom }
    val executor = ExceptionCatchingExecutor()
    client =
      client
        .newBuilder()
        .dispatcher(Dispatcher(executor))
        .build()

        this.lookup = requireNonNull(lookup);
        this.defaultLifeCycles = requireNonNull(defaultLifeCycles);
    }

    // These methods deal with construction intact Plugin object that look like they come from a standard
    // <plugin/> block in a Maven POM. We have to do some wiggling to pull the sources of information
    // together and this really shows the problem of constructing a sensible default configuration, but