https://www.graalvm.org/ 
public abstract class com.oracle.truffle.api.instrumentation.test.GenerateWrapperTest$ErrorNode7 extends com.oracle.truffle.api.nodes.Node
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.instrumentation.test.GenerateWrapperTest$ErrorNode7
  super_class: com.oracle.truffle.api.nodes.Node
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.instrumentation.test.GenerateWrapperTest$ErrorNode7 this
         0: .line 926
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.nodes.Node.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.instrumentation.test.GenerateWrapperTest$ErrorNode7 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/instrumentation/test/GenerateWrapperTest$ErrorNode7;
}
SourceFile: "GenerateWrapperTest.java"
NestHost: com.oracle.truffle.api.instrumentation.test.GenerateWrapperTest
InnerClasses:
  public abstract ErrorNode7 = com.oracle.truffle.api.instrumentation.test.GenerateWrapperTest$ErrorNode7 of com.oracle.truffle.api.instrumentation.test.GenerateWrapperTest
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.test.ExpectError(value = {"Classes annotated with @GenerateWrapper must implement InstrumentableNode."})
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.instrumentation.GenerateWrapper()