}

  private Throwable popLoggedThrowable() {
    List<LogRecord> logRecords = logHandler.getStoredLogRecords();
    assertEquals(1, logRecords.size());
    LogRecord logRecord = logRecords.get(0);
    logHandler.clear();
    return logRecord.getThrown();
  }

  private void checkNothingLogged() {
    assertThat(logHandler.getStoredLogRecords()).isEmpty();
  }

  private void checkLoggedCause(Throwable t) {

    public boolean addAll(Collection<? extends E> c) {
      synchronized (mutex) {
        return delegate().addAll(c);
      }
    }

    @Override
    public void clear() {
      synchronized (mutex) {
        delegate().clear();
      }
    }

    @Override
    public boolean contains(@CheckForNull Object o) {
      synchronized (mutex) {
        return delegate().contains(o);
      }
    }

      // field read instead of a read, several branches and possibly creating exceptions).
      Object v = ((AbstractFuture<?>) future).value;
      if (v instanceof Cancellation) {
        // If the other future was interrupted, clear the interrupted bit while preserving the cause
        // this will make it consistent with how non-trustedfutures work which cannot propagate the
        // wasInterrupted bit
        Cancellation c = (Cancellation) v;

  }

  private Throwable popLoggedThrowable() {
    List<LogRecord> logRecords = logHandler.getStoredLogRecords();
    assertEquals(1, logRecords.size());
    LogRecord logRecord = logRecords.get(0);
    logHandler.clear();
    return logRecord.getThrown();
  }

  private void checkNothingLogged() {
    assertThat(logHandler.getStoredLogRecords()).isEmpty();
  }

  private void checkLoggedCause(Throwable t) {

    }
    try {
      unmod.merge(4, "four", (k, v) -> v);
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      unmod.clear();
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }

    /* UnsupportedOperationException on indirect modifications. */

     * either it got collected, or {@link #clear} was called, or it wasn't set in the first place).
     */
    @CheckForNull
    V get();

    /** Returns the entry which contains this {@link WeakValueReference}. */
    E getEntry();

    /** Unsets the referenced value. Subsequent calls to {@link #get} will return {@code null}. */
    void clear();

    /**

     * @throws UnsupportedOperationException always
     * @deprecated Unsupported operation.
     */
    @Deprecated
    @Override
    @DoNotCall("Always throws UnsupportedOperationException")
    public final void clear() {
      throw new UnsupportedOperationException();
    }

    /**
     * Scope the return type to {@link UnmodifiableIterator} to ensure this is an unmodifiable view.
     *

      writer.println("Expected no failures, but found:");
      for (AssertionError failure : failures) {
        failure.printStackTrace(writer);
      }
      failures.clear();
      assertWithMessage(message.toString()).fail();
    }
  }

  static final class TestCloseable implements Closeable {
    private final CountDownLatch latch = new CountDownLatch(1);

   * worthwhile only if the precomputed matcher is queried many thousands of times.
   *
   * <p>This method has no effect (returns {@code this}) when called in GWT: it's unclear whether a
   * precomputed matcher is faster, but it certainly consumes more memory, which doesn't seem like a
   * worthwhile tradeoff in a browser.
   */
  public CharMatcher precomputed() {

      if (occurrences >= oldCount) {
        values.clear();
      } else {
        Iterator<V> iterator = values.iterator();
        for (int i = 0; i < occurrences; i++) {
          iterator.next();
          iterator.remove();
        }
      }
      return oldCount;
    }

    @Override
    public void clear() {
      multimap.clear();
    }

    @Override