public interface jdk.nashorn.internal.ir.FunctionCall
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.nashorn.internal.ir.FunctionCall
  super_class: java.lang.Object
{
  public abstract boolean isFunction();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "FunctionCall.java"