http://www.antlr.org: A framework for constructing recognizers, compilers, and translators from grammatical descriptions containing Java, C#, C++, or Python actions. (ANTLR) 
public interface org.antlr.runtime.tree.TreeFilter$fptr
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.antlr.runtime.tree.TreeFilter$fptr
  super_class: java.lang.Object
{
  public abstract void rule();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws org.antlr.runtime.RecognitionException
}
SourceFile: "TreeFilter.java"
NestHost: org.antlr.runtime.tree.TreeFilter
InnerClasses:
  public abstract fptr = org.antlr.runtime.tree.TreeFilter$fptr of org.antlr.runtime.tree.TreeFilter