https://www.graalvm.org/ 
interface com.oracle.truffle.api.test.FrameDescriptorThreadSafetyTest$Contention<V>
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.test.FrameDescriptorThreadSafetyTest$Contention
  super_class: java.lang.Object
{
  public abstract V run(int, );
    descriptor: (II)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (II)TV;
    MethodParameters:
            Name  Flags
      partyIndex  
      iteration   
}
Signature: <V:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "FrameDescriptorThreadSafetyTest.java"
NestHost: com.oracle.truffle.api.test.FrameDescriptorThreadSafetyTest
InnerClasses:
  abstract Contention = com.oracle.truffle.api.test.FrameDescriptorThreadSafetyTest$Contention of com.oracle.truffle.api.test.FrameDescriptorThreadSafetyTest