src/java.base/share/classes/java/lang/invoke/MethodType.java

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  package java.lang.invoke;
  
  import java.lang.constant.ClassDesc;
  import java.lang.constant.Constable;
  import java.lang.constant.MethodTypeDesc;
- import java.lang.ref.Reference;
- import java.lang.ref.ReferenceQueue;
- import java.lang.ref.WeakReference;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.function.Supplier;
  import java.util.List;
  import java.util.Map;
  import java.util.NoSuchElementException;
  import java.util.Objects;
  import java.util.Optional;
  import java.util.StringJoiner;
  import java.util.concurrent.ConcurrentHashMap;
- import java.util.concurrent.ConcurrentMap;
  import java.util.stream.Stream;
  
  import jdk.internal.util.ReferencedKeySet;
  import jdk.internal.util.ReferenceKey;
  import jdk.internal.vm.annotation.Stable;
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