static int getIntOrMinus1(L c, int i) {
  ret toIntOrMinus1(getOpt(c, i));
}

static int getIntOrMinus1(Map map, O key) {
  ret toIntOrMinus1(mapGet(map, key));
}

static int getIntOrMinus1(O o, O field) {
  ret toIntOrMinus1(getOpt(o, (S) field));
}