*/
  @CanIgnoreReturnValue
  public E removeFirst() {
    return remove();
  }

  /**
   * Retrieves, but does not remove, the least element of this queue, or returns {@code null} if the
   * queue is empty.
   */
  public @Nullable E peekFirst() {
    return peek();
  }

  /**
   * Removes and returns the greatest element of this queue, or returns {@code null} if the queue is
   * empty.
   */

      iterator.remove();
      assertEquals(initialSize - 1, map.size());

      // Use "entryCopy" instead of "entry" because "entry" might be invalidated after
      // iterator.remove().
      assertFalse(entrySet.contains(entryCopy));
      assertInvariants(map);
      assertThrows(IllegalStateException.class, iterator::remove);
    } else {
      iterator.next();

        throw e;
      }
    }

    @Override
    public void remove() {
      if (nextThrewException) {
        throw new IllegalStateException();
      }
      iterator.remove();
    }
  }

  public void testCanCatchJdkBug6529795InTargetIterator() {
    try {
      /* Choose 4 steps to get sequence [next, next, next, remove] */
      new IteratorTester<Integer>(

      }

      Entry<?, ?> entry = (Entry<?, ?>) object;
      inverse.delegate.remove(entry.getValue());
      /*
       * Remove the mapping in inverse before removing from esDelegate because
       * if entry is part of esDelegate, entry might be invalidated after the
       * mapping is removed from esDelegate.
       */
      esDelegate.remove(entry);
      return true;
    }

    @Override

      assertThat(table.get("foo", 3)).isNull();
      assertThat(table.remove(null, 1)).isNull();
      assertThat(table.remove("foo", null)).isNull();
      assertThat(table.remove(null, null)).isNull();
      assertSize(2);
    } else {
      assertThrows(UnsupportedOperationException.class, () -> table.remove("foo", 3));
      assertEquals((Character) 'c', table.get("foo", 3));
    }
  }

    } catch (UnsupportedOperationException expected) {
    }
    assertMultimapRemainsUnmodified(multimap, originalEntries);

    // Test #remove()
    try {
      multimap.remove(sampleKey, sampleValue);
      fail("remove succeeded on unmodifiable multimap");
    } catch (UnsupportedOperationException expected) {
    }
    assertMultimapRemainsUnmodified(multimap, originalEntries);

      return delegate.poll();
    }

    @Override
    public E remove() {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.remove();
    }

    @Override
    public boolean remove(Object object) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.remove(object);
    }

    @Override
    public @Nullable E peek() {

	createCallback.Remove("c1")
	if ok, msg := assertCallbacks(createCallback, []string{"c3", "c4", "c2"}); !ok {
		t.Errorf("callbacks tests failed, got %v", msg)
	}

	createCallback.Remove("c4")
	if ok, msg := assertCallbacks(createCallback, []string{"c3", "c2"}); !ok {
		t.Errorf("callbacks tests failed, got %v", msg)
	}

	createCallback.Remove("c2")

  public void testRemove_empty() {
    assertThrows(NoSuchElementException.class, () -> getQueue().remove());
    expectUnchanged();
  }

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  @CollectionSize.Require(ONE)
  public void testRemove_size1() {
    assertEquals("size1Queue.remove() should return first element", e0(), getQueue().remove());
    expectMissing(e0());
  }

  @CollectionFeature.Require({KNOWN_ORDER, SUPPORTS_REMOVE})

  }

  /**
   * A sensible definition of {@link #remove(Object)} in terms of {@link #remove(Object, int)}. If
   * you override {@link #remove(Object, int)}, you may wish to override {@link #remove(Object)} to
   * forward to this implementation.
   *
   * @since 7.0
   */
  @Override
  protected boolean standardRemove(@Nullable Object element) {
    return remove(element, 1) > 0;
  }

  /**