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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A doc comment that is not attached to anything has been encountered.

Erroneous code example:

```compile_fail,E0584
trait Island {
    fn lost();

    /// I'm lost!
}
```

A little reminder: a doc comment has to be placed before the item it's supposed
to document. So if you want to document the `Island` trait, you need to put a
doc comment before it, not inside it. Same goes for the `lost` method: the doc
comment needs to be before it:

```
/// I'm THE island!
trait Island {
    /// I'm lost!
    fn lost();
}
```