https://www.graalvm.org/ 
public interface com.oracle.truffle.sl.test.SLJavaInteropTest$PassInArgAndVarArg
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.sl.test.SLJavaInteropTest$PassInArgAndVarArg
  super_class: java.lang.Object
{
  public abstract void call(java.lang.Object, java.lang.Object[]);
    descriptor: (Ljava/lang/Object;[Ljava/lang/Object;)V
    flags: (0x0481) ACC_PUBLIC, ACC_VARARGS, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      first  
      arr    
}
SourceFile: "SLJavaInteropTest.java"
NestHost: com.oracle.truffle.sl.test.SLJavaInteropTest
InnerClasses:
  public abstract PassInArgAndVarArg = com.oracle.truffle.sl.test.SLJavaInteropTest$PassInArgAndVarArg of com.oracle.truffle.sl.test.SLJavaInteropTest
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()