static Method hashMap_getKey_method;

static <A, B> A hashMap_getKey(HashMap<A, B> map, O key) {
  if (hashMap_getKey_method == null)
    hashMap_getKey_method = findMethodNamed(HashMap.class, "getNode");
  Map.Entry<A, B> entry = (Map.Entry) hashMap_getKey_method.invoke(map, hashMap_internalHash(wkey), key);
  // java.util.Map.Entry<A, B> entry = (java.util.Map.Entry) call(hash, 'getNode, hashMap_internalHash(wkey), wkey);
  ret entry == null ? null : entry.getKey();
}