svoid setFieldToIVF1Proxy(O o, S field, IVF1 target) {
  if (o == null || target == null) ret;
  Class type = fieldType(o, field);
  if (type == null) fail("Field " + field + " not found in " + className(o));
  set(o, field, singleObjectMethodProxy(type, target, "get"));
}