valueItr = entry.getValue().iterator();
        }
        /*
         * requireNonNull is safe: The first call to this method always enters the !hasNext() case
         * and populates currentKey, after which it's never cleared.
         */
        return immutableEntry(requireNonNull(currentKey), valueItr.next());
      }
    };
  }

  /**

import static com.google.common.collect.CollectPreconditions.checkNonnegative;
import static java.lang.Math.max;
import static java.util.Arrays.asList;
import static java.util.Objects.requireNonNull;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.MoreObjects;

import static com.google.common.collect.Lists.newArrayListWithExpectedSize;
import static com.google.common.collect.Maps.safeGet;
import static java.lang.Math.max;
import static java.util.Objects.requireNonNull;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.annotations.VisibleForTesting;

    checkNotNull(ip);
    if (ip instanceof Inet4Address) {
      // For IPv4, Java's formatting is good enough.
      // requireNonNull accommodates Android's @RecentlyNullable annotation on getHostAddress
      return requireNonNull(ip.getHostAddress());
    }
    byte[] bytes = ip.getAddress();
    int[] hextets = new int[IPV6_PART_COUNT];
    for (int i = 0; i < hextets.length; i++) {

      case 0:
        return of();
      case 1:
        /*
         * requireNonNull is safe because the callers promise to put non-null objects in the first
         * `length` array elements.
         */
        @SuppressWarnings("unchecked") // our callers put only E instances into the array
        E onlyElement = (E) requireNonNull(elements[0]);
        return of(onlyElement);
      default:
        /*

        this(messageBuilderFactory, logger, -1);
    }

    public ExecutionEventLogger(MessageBuilderFactory messageBuilderFactory, Logger logger, int terminalWidth) {
        this.logger = Objects.requireNonNull(logger, "logger cannot be null");
        this.messageBuilderFactory = messageBuilderFactory;
        this.terminalWidth = terminalWidth;
    }

    private static String chars(char c, int count) {

        static Session newSession(RepositorySystem system, Lookup lookup, Context context) {

            // SettingsDecrypter settingsDecrypter =
            // (SettingsDecrypter)Objects.requireNonNull(this.createSettingsDecrypter(preBoot));
            //        new DefaultProfileSelector(List.of(
            //                new JdkVersionProfileActivator(),
            //                new PropertyProfileActivator(),

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Throwables.throwIfUnchecked;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.Objects.requireNonNull;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.CharMatcher;
import com.google.common.base.Equivalence;

        ImmutableList<AbstractFuture<T>> delegates, int inputFutureIndex) {
      /*
       * requireNonNull is safe because we accepted an Iterable of non-null Future instances, and we
       * don't overwrite an element in the array until after reading it.
       */
      ListenableFuture<? extends T> inputFuture = requireNonNull(inputFutures[inputFutureIndex]);
      // Null out our reference to this future, so it can be GCed

        this.set = true;
        this.value = value;
      }

      T get() {
        /*
         * requireNonNull is safe because we call get() only if we've previously called set().
         *
         * (For further discussion of nullness, see the comment above the method.)
         */
        return requireNonNull(value);
      }
    }
    OptionalState state = new OptionalState();