static LinkedHashMap mapLike mapToOrderedMap(O f, Iterable l) {
  new LinkedHashMap map;
  fOr (O o : l) {
    Pair p = cast callF(f, o);
    map.put(p.a, p.b);
  }
  ret map;
}

static <A, B, C> LinkedHashMap<B, C> mapLike mapToOrderedMap(IF1<A, Pair<B, C>> f, Iterable<A> l) {
  new LinkedHashMap<B, C> map;
  fOr (A o : l) {
    Pair<B, C> p = callF(f, o);
    map.put(p.a, p.b);
  }
  ret map;
}

static <A, B, C> LinkedHashMap<B, C> mapToOrderedMap(Iterable<A> l, IF1<A, Pair<B, C>> f) {
  ret mapToOrderedMap(f, l);
}

Began life as a copy of #1024294