svoid tok_selfType(L<S> tok) {
  int i;
  mainLoop: while ((i = jfind(tok, "selfType <id>")) >= 0) {
    // Now find class name by going backwards.
    
    int j = i, level = 1;
    while (j > 0 && level > 0) {
      t = tok.get(j);
      if (t.equals("}")) ++level;
      if (t.equals("{")) --level;
      j -= 2;
    }
    
    // search for class name
    while (j > 0) {
      t = tok.get(j);
      if (t.equals("class")) {
        String className = tok.get(j+2);
        tok.set(i, className);
        
        continue mainLoop;
      }
      j -= 2;
    }
    tok.set(i, "unknownSelfType"); // avoid endless loop
  }
}