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abstract sclass CTNode {
  new LinkedHashSet<CTNode> children;
  
  toString { ret shortClassName(this) + ": " + toString2(); }
  abstract S toString2();
  
  bool add(CTNode n) { ret children.add(n); }
}

sclass TextNode > CTNode {
  S text;
  
  *() {}
  *(S *text) {}
  
  S toString2() { ret quote(text); }
}

sclass TokNode > CTNode {
  L<S> tok;
  
  *() {}
  *(LS *tok) {}
  
  S toString2() { ret sfu(tok); }
  
  public bool equals(O o) { ret stdEq(this, o, 'tok); }
  public int hashCode() { ret stdHash(this, 'tok); }
}

sclass ObjectNode > CTNode {
  O obj;
  
  *() {}
  *(O *obj) {}
  
  S toString2() { ret sfu(obj); }
  
  public bool equals(O o) { ret stdEq(this, o, 'obj); }
  public int hashCode() { ret stdHash(this, 'obj); }
}

sclass OpNode > CTNode {
  S op;
  O result; // this is the result coming back up from the operation
  
  *() {}
  *(S *op) {}
  
  S toString2() { ret op; }
  
  public bool equals(O o) { ret stdEq(this, o, 'op); }
  public int hashCode() { ret stdHash(this, 'op); }
}