import java.util.ArrayList;
import java.util.Deque;</BUG>
import java.util.HashSet;
<BUG>import java.util.List;
import java.util.Set;
public final class Anvil {</BUG>
public interface Renderable {
void view();
}
public interface AttrFunc<T> {

import java.util.ArrayList;
import java.util.Collections;
import java.util.Deque;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;
public final class Anvil {
public interface Renderable {
void view();
}
public interface AttrFunc<T> {
