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`impl Trait` is not allowed in path parameters.
Erroneous code example:
```compile_fail,E0667
fn some_fn(mut x: impl Iterator) -> <impl Iterator>::Item { // error!
x.next().unwrap()
}
```
You cannot use `impl Trait` in path parameters. If you want something
equivalent, you can do this instead:
```
fn some_fn<T: Iterator>(mut x: T) -> T::Item { // ok!
x.next().unwrap()
}
```
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