The following code:

```
void get( out int i)
{
    i = 42;
}

struct Foo {
    int v;
    alias v this;
}

void main ()
{
    Foo f;
    get(f);
    assert(f == 42);
}
```

Produce the following error:
reg.d(14): Error: function reg.get (out int i) is not callable using argument types (Foo)

It used to work in 2.066, broke in 2.067, and is still broken.
It still works with `ref`, though.