entries[entryIndex] = effectiveEntry;
    }
    if (duplicates != null) {
      // Explicit type parameters needed here to avoid a problem with nullness inference.
      entries = RegularImmutableMap.<K, V>removeDuplicates(entries, n, n - dupCount, duplicates);
      int newTableSize = Hashing.closedTableSize(entries.length, MAX_LOAD_FACTOR);
      if (newTableSize != tableSize) {
        return fromEntryArrayCheckingBucketOverflow(