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Rollup merge of #69670 - GuillaumeGomez:explain-e0379, r=Dylan-DPC

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Add explanation for E0379

r? @Dylan-DPC
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Dylan DPC 2020-03-03 21:26:18 +01:00 committed by GitHub
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src/librustc_error_codes/error_codes/E0379.md
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@ -1,3 +1,15 @@
A trait method was declared const.
Erroneous code example:
```compile_fail,E0379
#![feature(const_fn)]
trait Foo {
const fn bar() -> u32; // error!
}
```
Trait methods cannot be declared `const` by design. For more information, see
[RFC 911].