pub/priv qualifiers on variants don't seem to get serialized

private_variant_1.rs:

```
mod super_sekrit {
    pub enum sooper_sekrit {
        priv baz
    }
}
```

private_variant_2.rs:

```
// aux-build:private_variant_1.rs
extern mod private_variant_1;

fn main() {
    let _x = private_variant_1::super_sekrit::baz; //~ ERROR baz is private
}
```

This compiles successfully, but should fail.
