rustc-ap-rustc_error_codes 638.0.0

Automatically published version of the package `rustc_error_codes` in the rust-lang/rust repository from commit 30ca215b4e38b32aa7abdd635c5e2d56f5724494 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
Documentation 
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This error indicates that a incorrect visibility restriction was specified.

Example of erroneous code:

```compile_fail,E0704
mod foo {
    pub(foo) struct Bar {
        x: i32
    }
}
```

To make struct `Bar` only visible in module `foo` the `in` keyword should be
used:
```
mod foo {
    pub(in crate::foo) struct Bar {
        x: i32
    }
}
# fn main() {}
```

For more information see the Rust Reference on [Visibility].

[Visibility]: https://doc.rust-lang.org/reference/visibility-and-privacy.html