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Visibility is restricted to a module which isn't an ancestor of the current
item.
Erroneous code example:
```compile_fail,E0742,edition2018
pub mod sea {}
pub (in crate::sea) struct Shark; // error!
fn main() {}
```
To fix this error, we need to move the `Shark` struct inside the `sea` module:
```edition2018
pub mod sea {
pub (in crate::sea) struct Shark; // ok!
}
fn main() {}
```
Of course, you can do it as long as the module you're referring to is an
ancestor:
```edition2018
pub mod earth {
pub mod sea {
pub (in crate::earth) struct Shark; // ok!
}
}
fn main() {}
```
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