// ext1.ast
// an extension module for example.ast

// this should go before any classes in the generated file
verbatim {
  // first verbatim in ext1.ast
}

// another visitor?  now it's an error
//option visitor ExtVisitor;

class Node (int z) {
  public int an_annotation;
}

class Super {
  -> Sub3(int q);
  -> Sub4 {
       public int r;
     }
}

class NodeList {
  -> ASubclass(int x);
}

// you can extend a given nonterminal several times
// in an extension file
class NodeList {
  -> AnotherSubclass(int x);
}

verbatim {
  // verbatim before ANewClass
}

new class ANewClass(int foo);


// extension of an enum
enum AnEnum { AE_FOUR };