[Issue 22916] [dip1000] copy of ref return still treated as scope variable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22916

--- Comment #12 from Dennis <dkorpel at live.nl> ---
I've found a workaround for this issue by the way: convert the `ref` return to
a pointer and dereference that to get the non-scope value.
```
// compile with -preview=dip1000
@safe:
struct Arr
{
    int** ptr;

    ref int* index() return scope {
        return *ptr;
    }

    void assign(int* p) scope {
        *ptr = p;
    }
}

void main()
{
    scope Arr a;

    a.assign(*&a.index());

    auto tmp = &a.index();
    a.assign(*tmp);
}
```

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