https://www.graalvm.org/ 
class com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry$2 implements java.lang.AutoCloseable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry$2
  super_class: java.lang.Object
{
  final com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry this$0;
    descriptor: Lcom/oracle/svm/hosted/snippets/IntrinsificationPluginRegistry;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry);
    descriptor: (Lcom/oracle/svm/hosted/snippets/IntrinsificationPluginRegistry;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry$2 this
         0: .line 131
            aload 0 /* this */
            aload 1
            putfield com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry$2.this$0:Lcom/oracle/svm/hosted/snippets/IntrinsificationPluginRegistry;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 133
            ldc Lcom/oracle/svm/hosted/phases/IntrinsifyMethodHandlesInvocationPlugin$IntrinsificationRegistry;
            invokestatic org.graalvm.nativeimage.ImageSingletons.lookup:(Ljava/lang/Class;)Ljava/lang/Object;
            checkcast com.oracle.svm.hosted.phases.IntrinsifyMethodHandlesInvocationPlugin$IntrinsificationRegistry
            getfield com.oracle.svm.hosted.phases.IntrinsifyMethodHandlesInvocationPlugin$IntrinsificationRegistry.threadLocalRegistry:Ljava/lang/ThreadLocal;
            new java.util.concurrent.ConcurrentHashMap
            dup
            invokespecial java.util.concurrent.ConcurrentHashMap.<init>:()V
            invokevirtual java.lang.ThreadLocal.set:(Ljava/lang/Object;)V
         2: .line 131
            return
        end local 0 // com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/svm/hosted/snippets/IntrinsificationPluginRegistry$2;
    MethodParameters:
        Name  Flags
      this$0  final

  public void close();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry$2 this
         0: .line 138
            ldc Lcom/oracle/svm/hosted/phases/IntrinsifyMethodHandlesInvocationPlugin$IntrinsificationRegistry;
            invokestatic org.graalvm.nativeimage.ImageSingletons.lookup:(Ljava/lang/Class;)Ljava/lang/Object;
            checkcast com.oracle.svm.hosted.phases.IntrinsifyMethodHandlesInvocationPlugin$IntrinsificationRegistry
            getfield com.oracle.svm.hosted.phases.IntrinsifyMethodHandlesInvocationPlugin$IntrinsificationRegistry.threadLocalRegistry:Ljava/lang/ThreadLocal;
            invokevirtual java.lang.ThreadLocal.remove:()V
         1: .line 139
            return
        end local 0 // com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/svm/hosted/snippets/IntrinsificationPluginRegistry$2;
}
SourceFile: "IntrinsificationPluginRegistry.java"
EnclosingMethod: com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry.startThreadLocalIntrinsificationRegistry:()Ljava/lang/AutoCloseable;
NestHost: com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry
InnerClasses:
  public IntrinsificationRegistry = com.oracle.svm.hosted.phases.IntrinsifyMethodHandlesInvocationPlugin$IntrinsificationRegistry of com.oracle.svm.hosted.phases.IntrinsifyMethodHandlesInvocationPlugin
  com.oracle.svm.hosted.snippets.IntrinsificationPluginRegistry$2