const A = 1;
        const B = 1 << 1;

        const _ = !0;
    }
}
```

Flags types may define multiple unnamed flags:

```
# use bitflags::bitflags;
bitflags! {
    struct Flags: u8 {
        const _ = 1;
        const _ = 1 << 1;
    }
}
```