*/
  public <K1 extends K, V1 extends V> CacheBuilder<K1, V1> removalListener(
      RemovalListener<? super K1, ? super V1> listener) {
    checkState(this.removalListener == null);

    // safely limiting the kinds of caches this can produce
    @SuppressWarnings("unchecked")
    CacheBuilder<K1, V1> me = (CacheBuilder<K1, V1>) this;
    me.removalListener = checkNotNull(listener);
    return me;
  }

            }
            return key.toString();
          }
        };
    CountingRemovalListener<Integer, String> removalListener = countingRemovalListener();
    LoadingCache<Integer, String> cache =
        CacheBuilder.newBuilder().removalListener(removalListener).build(failOnceFunction);

    UncheckedExecutionException ue =