*   <li>clearing weak references to unreachable referents
   *   <li>enqueuing weak references to unreachable referents in their reference queue
   * </ul>
   */
  @DoNotMock("Implement with a lambda")
  public interface FinalizationPredicate {
    boolean isDone();
  }

  /**
   * Waits until the given weak reference is cleared, invoking the garbage collector as necessary to

   *   <li>clearing weak references to unreachable referents
   *   <li>enqueuing weak references to unreachable referents in their reference queue
   * </ul>
   */
  @DoNotMock("Implement with a lambda")
  public interface FinalizationPredicate {
    boolean isDone();
  }

  /**
   * Waits until the given weak reference is cleared, invoking the garbage collector as necessary to

	}

	references := make([]interface{}, 0, len(constraint.References))
	for _, field := range constraint.References {
		references = append(references, clause.Column{Name: field.DBName})
	}
	vars = append(vars, clause.Table{Name: constraint.Name}, foreignKeys, clause.Table{Name: constraint.ReferenceSchema.Table}, references)
	return
}

	// check relations
	relations := []Relation{
		{
			Name: "Account", Type: schema.HasOne, Schema: "User", FieldSchema: "Account",
			References: []Reference{{"ID", "User", "UserID", "Account", "", true}},
		},
		{
			Name: "Pets", Type: schema.HasMany, Schema: "User", FieldSchema: "Pet",
			References: []Reference{{"ID", "User", "UserID", "Pet", "", true}},
		},
		{
			Name: "Toys", Type: schema.HasMany, Schema: "User", FieldSchema: "Toy",

    if (threadStarted) {
      return;
    }

    Reference<?> reference;
    while ((reference = queue.poll()) != null) {
      /*
       * This is for the benefit of phantom references. Weak and soft references will have already
       * been cleared by this point.
       */
      reference.clear();
      try {
        ((FinalizableReference) reference).finalizeReferent();
      } catch (Throwable t) {

    assertNotNull(sepStopwatchA.get());
    // Clear all references to the Stopwatch and wait for it to be gc'd.
    sepStopwatchA.set(null);
    GcFinalization.awaitClear(sepStopwatchRef.get());
    // Return a weak reference to the parallel ClassLoader. This is the reference that should
    // eventually become clear if there are no other references to the ClassLoader.
    return new WeakReference<ClassLoader>(sepLoader);
  }

		var oldBelongsToExpr clause.Expression
		// we have to record the old BelongsTo value
		if association.Unscope && rel.Type == schema.BelongsTo {
			var foreignFields []*schema.Field
			for _, ref := range rel.References {
				if !ref.OwnPrimaryKey {
					foreignFields = append(foreignFields, ref.ForeignKey)
				}
			}

	)

	if rel.JoinTable != nil {
		var (
			joinForeignFields    = make([]*schema.Field, 0, len(rel.References))
			joinRelForeignFields = make([]*schema.Field, 0, len(rel.References))
			joinForeignKeys      = make([]string, 0, len(rel.References))
		)

		for _, ref := range rel.References {
			if ref.OwnPrimaryKey {
				joinForeignKeys = append(joinForeignKeys, ref.ForeignKey.DBName)

    protected void logSummary(C context, ExceptionSummary summary, Map<String, String> references, String indent) {
        String referenceKey = "";

        if (summary.getReference() != null && !summary.getReference().isEmpty()) {
            referenceKey =
                    references.computeIfAbsent(summary.getReference(), k -> "[Help " + (references.size() + 1) + "]");
        }

        String msg = summary.getMessage();

      /*
       * Using weak references here could let us release exceptions earlier, but:
       *
       * 1. On Android, querying a WeakReference blocks if the GC is doing an otherwise-concurrent
       * pass.
       *
       * 2. We would probably choose to compare exceptions using == instead of equals() (for
       * consistency with how weak references are cleared). That's a behavior change -- arguably the