android/guava/src/com/google/common/collect/AbstractListMultimap.java
@CanIgnoreReturnValue
  @Override
  public List<V> removeAll(@NullableDecl Object key) {
    return (List<V>) super.removeAll(key);
  }
@CanIgnoreReturnValue
  @Override
  public List<V> removeAll(@NullableDecl Object key) {
    return (List<V>) super.removeAll(key);
  }
{@inheritDoc}

<p>Because the values for a given key may have duplicates and follow the insertion ordering,
this method returns a {@link List}, instead of the {@link Collection} specified in the {@link
Multimap} interface.