Inherent associated types were part of [RFC 195] but are not yet implemented.
See [the tracking issue][iss8995] for the status of this implementation.

Erroneous code example:

```compile_fail,E0202
struct Foo;

impl Foo {
    type Bar = isize; // error!
}
```

[RFC 195]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
[iss8995]: https://github.com/rust-lang/rust/issues/8995
