ImmutableRangeMap.Builder::combine,
        ImmutableRangeMap.Builder::build);
  }

  // Multimaps

  static <T extends @Nullable Object, K, V>
      Collector<T, ?, ImmutableListMultimap<K, V>> toImmutableListMultimap(
          Function<? super T, ? extends K> keyFunction,
          Function<? super T, ? extends V> valueFunction) {
    checkNotNull(keyFunction, "keyFunction");
    checkNotNull(valueFunction, "valueFunction");

 */

package com.google.common.collect;

import static com.google.common.collect.ImmutableListMultimap.flatteningToImmutableListMultimap;
import static com.google.common.collect.ImmutableListMultimap.toImmutableListMultimap;
import static com.google.common.collect.ReflectionFreeAssertThrows.assertThrows;
import static com.google.common.collect.testing.Helpers.mapEntry;

   * corresponding to each key appear in the same order as they are encountered.
   *
   * <p><b>{@code Stream} equivalent:</b> {@code
   * stream.collect(ImmutableListMultimap.toImmutableListMultimap(keyFunction, v -> v))}.
   *
   * @param keyFunction the function used to produce the key for each value
   * @throws NullPointerException if any element of this iterable is {@code null}, or if {@code

   * }
   * }
   *
   * <p>To collect to an {@link ImmutableMultimap}, use either {@link
   * ImmutableSetMultimap#toImmutableSetMultimap} or {@link
   * ImmutableListMultimap#toImmutableListMultimap}.
   *
   * @since 33.2.0 (available since 21.0 in guava-jre)
   */
  @IgnoreJRERequirement // Users will use this only if they're already using streams.
  public static <