svoid tok_printIfdef(LS tok) {
  for (S keyword : ll("print", "printVars"))
    for (int i : jfind_all_reversed(tok, keyword + " ifdef <id>")) {
      S flag = tok.get(i+4);
      int iEnd = tok_findEndOfStatement(tok, i+6);
      S args = joinSubList(tok, i+6, iEnd);
      tokReplace_reTok(tok, i, iEnd,
        "ifdef \*flag*/ \*keyword*/ \*args*/ endifdef ");
    }
}