https://www.graalvm.org/ 
public interface com.oracle.svm.core.SubstrateUtil$Thunk
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.svm.core.SubstrateUtil$Thunk
  super_class: java.lang.Object
{
  public abstract void invoke();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "SubstrateUtil.java"
NestHost: com.oracle.svm.core.SubstrateUtil
InnerClasses:
  public abstract Thunk = com.oracle.svm.core.SubstrateUtil$Thunk of com.oracle.svm.core.SubstrateUtil
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()