svoid tok_collectTransformers(LS tok, LS out, S keyword default "meta-transform") {
  int i = -1;
  while ((i = jfind(tok, i+1, keyword + " {")) >= 0) {
    int iOpening = indexOf(tok, i, "{");
    int iClosing = findEndOfBracketPart(tok, iOpening)-1;
    add(out, joinSubList(tok, iOpening+2, iClosing-1));
    clearTokens_reTok(tok, i, iClosing+1);
  }
}