assertTrue(logHandler.getStoredLogRecords().isEmpty());
  }

  private void checkLogged(Throwable t) {
    assertSame(t, popLoggedThrowable());
  }

  /*
   * TODO(cpovirk): Can we replace makeLocalCache with a call to builder.build()? Some tests may
   * need access to LocalCache APIs, but maybe we can at least make makeLocalCache use
   * builder.build() and then cast?
   */

    assertTrue(logHandler.getStoredLogRecords().isEmpty());
  }

  private void checkLogged(Throwable t) {
    assertSame(t, popLoggedThrowable());
  }

  /*
   * TODO(cpovirk): Can we replace makeLocalCache with a call to builder.build()? Some tests may
   * need access to LocalCache APIs, but maybe we can at least make makeLocalCache use
   * builder.build() and then cast?
   */

   *                 return countDifferentLines(file1Reader, file2Reader);
   *               },
   *               executor)
   *           .closing(executor);
   * }</pre>
   */
  // TODO(cpovirk): Use simple name instead of fully qualified after we stop building with JDK 8.
  @com.google.errorprone.annotations.DoNotMock(
      "Use ClosingFuture.whenAllSucceed() or .whenAllComplete() instead.")

      V leftValue = entry.getValue();
      if (right.containsKey(leftKey)) {
        /*
         * The cast is safe because onlyOnRight contains all the keys of right.
         *
         * TODO(cpovirk): Consider checking onlyOnRight.containsKey instead of right.containsKey.
         * That could change behavior if the input maps use different equivalence relations (and so

      V leftValue = entry.getValue();
      if (right.containsKey(leftKey)) {
        /*
         * The cast is safe because onlyOnRight contains all the keys of right.
         *
         * TODO(cpovirk): Consider checking onlyOnRight.containsKey instead of right.containsKey.
         * That could change behavior if the input maps use different equivalence relations (and so

 */
@SuppressWarnings({
  "GoodTime", // lots of violations (nanosecond math)
  "nullness", // too much trouble for the payoff
})
@GwtCompatible(emulated = true)
// TODO(cpovirk): Annotate for nullness.
class LocalCache<K, V> extends AbstractMap<K, V> implements ConcurrentMap<K, V> {

  /*
   * The basic strategy is to subdivide the table among Segments, each of which itself is a