@SuppressWarnings({"nullness", "unchecked"}) // see supertype
      public ImmutableSet<@NonNull E> immutableCopy() {
        ImmutableSet.Builder<@NonNull E> builder =
            new ImmutableSet.Builder<@NonNull E>()
                .addAll((Iterable<@NonNull E>) set1)
                .addAll((Iterable<@NonNull E>) set2);
        return (ImmutableSet<@NonNull E>) builder.build();
      }
    };
  }

  /**

        new ListFuture<V>(ImmutableList.copyOf(futures), true);
    // allAsList ensures that it fills the output list with V instances.
    @SuppressWarnings("nullness")
    ListenableFuture<List<V>> nonNull = nullable;
    return nonNull;
  }

  /**
   * Creates a new {@code ListenableFuture} whose value is a list containing the values of all its
   * input futures, if all succeed.
   *

        return delegate().compute(key, remappingFunction);
      }
    }

    @Override
    @CheckForNull
    public V merge(
        K key,
        @NonNull V value,
        BiFunction<? super @NonNull V, ? super @NonNull V, ? extends @Nullable V>
            remappingFunction) {
      synchronized (mutex) {
        return delegate().merge(key, value, remappingFunction);
      }
    }

        new ListFuture<V>(ImmutableList.copyOf(futures), true);
    // allAsList ensures that it fills the output list with V instances.
    @SuppressWarnings("nullness")
    ListenableFuture<List<V>> nonNull = nullable;
    return nonNull;
  }

  /**
   * Creates a new {@code ListenableFuture} whose value is a list containing the values of all its
   * input futures, if all succeed.
   *

import java.util.List;
import java.util.NoSuchElementException;
import java.util.PriorityQueue;
import java.util.Queue;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * This class contains static utility methods that operate on or return objects of type {@link

            DefaultModelProblemCollector problems) {
        if (profiles.stream()
                .map(org.apache.maven.api.model.Profile::getActivation)
                .noneMatch(Objects::nonNull)) {
            return profiles;
        }
        final Interpolator xform = new RegexBasedInterpolator();
        xform.setCacheAnswers(true);