entry.setValueReference(valueRef);

    // absent
    assertFalse(segment.removeLoadingValue(key, hash, valueRef));

    // live
    table.set(0, entry);
    // don't increment count; this is used during computation
    assertTrue(segment.removeLoadingValue(key, hash, valueRef));
    // no notification sent with removeLoadingValue
    assertTrue(map.removalNotificationQueue.isEmpty());

    entry.setValueReference(valueRef);

    // absent
    assertFalse(segment.removeLoadingValue(key, hash, valueRef));

    // live
    table.set(0, entry);
    // don't increment count; this is used during computation
    assertTrue(segment.removeLoadingValue(key, hash, valueRef));
    // no notification sent with removeLoadingValue
    assertTrue(map.removalNotificationQueue.isEmpty());

            throw new AssertionError("impossible; Futures.immediateFuture can't throw");
          }
        } else if (createNewEntry || valueReference.isLoading()) {
          removeLoadingValue(key, hash, computingValueReference);
          return null;
        } else {
          removeEntry(e, hash, RemovalCause.EXPLICIT);
          return null;
        }
      } finally {