Find struct not passed by reference

[frame]

On Tuesday, 3 August 2021 at 10:25:34 UTC, frame wrote:

> This could work, thanks for the hint.

I was too optimistic. I get the error:

```
struct `std.typecons.Unique!(myType).Unique` is not copyable 
because it is annotated with `@disable`
```

on a line like:

```d
Unique!myType rs = query();
```

which body is:

```d
ref Unique!myType query(A...)(A args)
{
    return queryImpl(args); // also ref to ref, back to creation 
of the struct
}
```

It's not an Unique! problem, I also get the error if I just 
disable the postblit.
Removing the ref from queryImpl! prints the error at query(), so 
it really sees the error just at the line above but why?