https://www.graalvm.org/ 
interface com.oracle.truffle.api.test.host.HostInteropErrorTest$InteropRunnable
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.test.host.HostInteropErrorTest$InteropRunnable
  super_class: java.lang.Object
{
  public abstract void run();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.lang.Exception
}
SourceFile: "HostInteropErrorTest.java"
NestHost: com.oracle.truffle.api.test.host.HostInteropErrorTest
InnerClasses:
  abstract InteropRunnable = com.oracle.truffle.api.test.host.HostInteropErrorTest$InteropRunnable of com.oracle.truffle.api.test.host.HostInteropErrorTest
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()