// map will return exception as value in case of error
static Map<S, O> evaluateFunctionsAsMap(Collection<S> functions, O... args) {
  Class c = loadFunctions_cached(functions);
  new LinkedHashMap<S, O> map;
  for ping (S f : functions) {
    try {
      map.put(f, preciseCall(c, f, args));
    } catch e {
      map.put(f, e);
    }
  }
  ret map;
}