https://openjdk.java.net/ 
public interface jdk.nashorn.internal.ir.Labels
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.nashorn.internal.ir.Labels
  super_class: java.lang.Object
{
  public abstract java.util.List<jdk.nashorn.internal.codegen.Label> getLabels();
    descriptor: ()Ljava/util/List;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Ljava/util/List<Ljdk/nashorn/internal/codegen/Label;>;
}
SourceFile: "Labels.java"