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Add explanation for E0380 #69697

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Mar 6, 2020
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Add explanation for E0380 #69697

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14 changes: 12 additions & 2 deletions src/librustc_error_codes/error_codes/E0380.md
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Auto traits cannot have methods or associated items.
For more information see the [opt-in builtin traits RFC][RFC 19].
An auto trait was declared with a method or an associated item.

Erroneous code example:

```compile_fail,E0380
unsafe auto trait Trait {
type Output; // error!
}
```

Auto traits cannot have methods or associated items. For more information see
the [opt-in builtin traits RFC][RFC 19].

[RFC 19]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md