static SimpleLiveValue conceptFieldLiveValue(Concept c, S fieldName) {
  Class type = getFieldType(c, fieldName);
  SimpleLiveValue value = new(type, cget(c, fieldName));
  // TODO: make mechanism for listening to a single concept
  onConceptChangeByClass_notOnAllChanged(c.getClass(), r {
    O o = cget(c, fieldName);
    value.set(o);
  });
  value.onChange(r {
    cset(c, fieldName, value!);
  });
  ret value;
}

static SimpleLiveValue mapMethodLike conceptFieldLiveValue(S fieldName, Concept c) {
  ret conceptFieldLiveValue(c, fieldName);
}