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Rollup merge of #69697 - GuillaumeGomez:explanation-e0380, r=Dylan-DPC

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Add explanation for E0380

r? @Dylan-DPC
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Dylan DPC 2020-03-05 22:03:58 +01:00 • committed by GitHub
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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