!752

// PersistentLog is defined in #1001972

static PersistentLog<MyType> log;

static class MyType {
  S a;
  int b;
}

p {
  log = new PersistentLog<MyType>("mylog");
  new MyType x;
  x.a = "I am new";
  x.b = l(log);
  log.add(x);
  print(structure(log));
}