// hasNext/next/peek), but we'll cop out for now, knowing that peek() and
  // next() both start by invoking hasNext() anyway.

  /** Throws an undeclared checked exception. */
  private static void sneakyThrow(Throwable t) {
    class SneakyThrower<T extends Throwable> {
      @SuppressWarnings("unchecked") // not really safe, but that's the point

    }

    private void add(@Nullable Object[] elements, int n) {
      getReadyToExpandTo(size + n);
      /*
       * The following call is not statically checked, since arraycopy accepts plain Object for its
       * parameters. If it were statically checked, the checker would still be OK with it, since
       * we're copying into a `contents` array whose type allows it to contain nulls. Still, it's

              newUpdater(AggregateFutureState.class, Set.class, "seenExceptions"),
              newUpdater(AggregateFutureState.class, "remaining"));
    } catch (Throwable reflectionFailure) { // sneaky checked exception
      // Some Android 5.0.x Samsung devices have bugs in JDK reflection APIs that cause
      // getDeclaredField to throw a NoSuchFieldException when the field is definitely there.

   * range. If {@code safeMax < safeMin} then no characters are considered safe.
   *
   * <p>If a character has no mapped replacement then it is checked against the safe range. If it
   * lies outside that, then {@link #escapeUnsafe} is called, otherwise no escaping is performed.
   *
   * @param replacementMap a map of characters to their escaped representations

    return false;
  }

  @Override
  public C first() {
    // requireNonNull is safe because we checked the range is not empty in ContiguousSet.create.
    return requireNonNull(range.lowerBound.leastValueAbove(domain));
  }

  @Override
  public C last() {
    // requireNonNull is safe because we checked the range is not empty in ContiguousSet.create.
    return requireNonNull(range.upperBound.greatestValueBelow(domain));

   * {@code null}; it may either return a non-null value or throw an exception.
   *
   * <p>No observable state associated with this cache is modified until loading completes.
   *
   * @throws ExecutionException if a checked exception was thrown while loading the value
   * @throws UncheckedExecutionException if an unchecked exception was thrown while loading the
   *     value
   * @throws ExecutionError if an error was thrown while loading the value

   * - https://github.com/jspecify/jdk/commit/71d826792b8c7ef95d492c50a274deab938f2552
   */
  /*
   * TODO(cpovirk): Is the unchecked cast avoidable? Would System.arraycopy be similarly fast (if
   * likewise not type-checked)? Could our single caller do something different?
   */
  @SuppressWarnings({"nullness", "unchecked"})
  static <T extends @Nullable Object> T[] copy(Object[] source, int from, int to, T[] arrayOfType) {

      }

      @Override
      public void run() {
        try {
          delegate.run();
        } catch (Throwable t) {
          // Any Exception is either a RuntimeException or sneaky checked exception.
          setException(t);
          throw t;
        }
      }

      @Override
      protected String pendingToString() {
        return "task=[" + delegate + "]";
      }
    }

    };

    abstract Equivalence<Object> defaultEquivalence();
  }

  /**
   * Implementation for the EntryIterator, which is used to build Key and Value iterators.
   *
   * <p>Expiration is only checked on hasNext(), so as to ensure that a next() call never returns
   * null when hasNext() has already been called.
   */
  class EntryIterator implements Iterator<Entry<K, V>> {
    Iterator<Entry<K, Timestamped<V>>> iterator;

          if (expectedMessage != null) {
            assertThat(expected).hasCauseThat().hasMessageThat().isEqualTo(expectedMessage);
          }
        }
      }
    },
    DECODE_CHECKED {
      @Override
      void assertFailsToDecode(
          BaseEncoding encoding, String cannotDecode, @Nullable String expectedMessage) {
        try {
          encoding.decodeChecked(cannotDecode);