svoid tok_returnSelf(LS tok) {
  int i;
  mainLoop: while ((i = jfind(tok, "returnSelf <id>")) >= 0) {
    IntRange block = tok_findFirstBlock(tok, i);
    tok.set(i, "selfType");
    tokPrepend(tok, block.end-1, " ret this; ");
  }
}