static AutoCloseable tempSetFieldToSingleMethodProxy(O o, S field, O target, S methodName) {
  if (o == null || target == null) null;
  Class type = fieldType(o, field);
  if (type == null) fail("Field " + field + " not found in " + className(o));
  ret tempSetField(o, field, singleObjectMethodProxy(type, target, methodName));
}