For example:
```
use futures::{compat::Compat01As03, future::BoxFuture, prelude::*};
```

and
```
use std::{
    fmt::{self, Display},
    result,
};
```

https://github.com/rust-lang/rust-clippy/issues/5456

the CI doesn't work anyway right now,
so no need to bother GitLab
with the impossible task.