if (value != null) {
              return Maps.immutableEntry(getKey(index), value);
            }
          }
          return endOfData();
        }
      };
    }

    // redeclare to help optimizers with b/310253115
    @SuppressWarnings("RedundantOverride")
    @J2ktIncompatible // serialization
    @Override
    @GwtIncompatible // serialization
    Object writeReplace() {

            if (value != null) {
              return Maps.immutableEntry(getKey(index), value);
            }
          }
          return endOfData();
        }
      };
    }

    // redeclare to help optimizers with b/310253115
    @SuppressWarnings("RedundantOverride")
    @J2ktIncompatible // serialization
    @Override
    @GwtIncompatible // serialization
    Object writeReplace() {