https://www.graalvm.org/ 
class com.oracle.truffle.api.instrumentation.test.InstrumentationTest$11 extends com.oracle.truffle.api.nodes.Node
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.instrumentation.test.InstrumentationTest$11
  super_class: com.oracle.truffle.api.nodes.Node
{
  final com.oracle.truffle.api.instrumentation.test.InstrumentationTest this$0;
    descriptor: Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.api.instrumentation.test.InstrumentationTest);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$11 this
         0: .line 1397
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.api.instrumentation.test.InstrumentationTest$11.this$0:Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest;
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.nodes.Node.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.instrumentation.test.InstrumentationTest$11 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/instrumentation/test/InstrumentationTest$11;
    MethodParameters:
        Name  Flags
      this$0  final
}
SourceFile: "InstrumentationTest.java"
EnclosingMethod: com.oracle.truffle.api.instrumentation.test.InstrumentationTest.testQueryTags1:()V
NestHost: com.oracle.truffle.api.instrumentation.test.InstrumentationTest
InnerClasses:
  com.oracle.truffle.api.instrumentation.test.InstrumentationTest$11