static <A extends Iterable> A pnl_nlBefore(S prefix, A l) {
  print();
  pnl(prefix, l);
  ret l;
}

static <A extends Iterable> A pnl_nlBefore(A l) {
  print();
  pnl(l);
  ret l;
}

svoid pnl_nlBefore(Map map) {
  print();
  pnl(map);
}

svoid pnl_nlBefore(O[] a) {
  print();
  pnl(a);
}

svoid pnl_nlBefore(S s) {
  print();
  pnl(lines(s));
}

Began life as a copy of #1008448