https://www.graalvm.org/ 
public interface com.oracle.truffle.js.test.threading.AsyncTaskTests$CallableInt
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.js.test.threading.AsyncTaskTests$CallableInt
  super_class: java.lang.Object
{
  public abstract void execute(org.graalvm.polyglot.Value);
    descriptor: (Lorg/graalvm/polyglot/Value;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.lang.InterruptedException
    MethodParameters:
          Name  Flags
      jsLambda  
}
SourceFile: "AsyncTaskTests.java"
NestHost: com.oracle.truffle.js.test.threading.AsyncTaskTests
InnerClasses:
  public abstract CallableInt = com.oracle.truffle.js.test.threading.AsyncTaskTests$CallableInt of com.oracle.truffle.js.test.threading.AsyncTaskTests
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()