[derive.param1.trivial] Unsupported type

```Inductive toto := | Toto : forall n, unit -> is_zero n = true-> toto.```

and

```Inductive toto := | Toto : forall n, is_zero n = true-> unit -> toto.```

are supported by  `#[only(param1_trivial)] derive toto.` while

```Inductive toto := | Toto : unit -> forall n, is_zero n = true -> toto.```

is not.