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Rollup merge of #69807 - GuillaumeGomez:cleanup-e0391, r=Dylan-DPC

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Cleanup E0391 explanation

r? @Dylan-DPC
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Mazdak Farrokhzad 2020-03-08 20:54:35 +01:00 committed by GitHub
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src/librustc_error_codes/error_codes/E0391.md
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@ -1,7 +1,6 @@
This error indicates that some types or traits depend on each other
and therefore cannot be constructed.
A type dependency cycle has been encountered.
The following example contains a circular dependency between two traits:
Erroneous code example:
```compile_fail,E0391
trait FirstTrait : SecondTrait {
@ -12,3 +11,6 @@ trait SecondTrait : FirstTrait {
}
```
The previous example contains a circular dependency between two traits:
`FirstTrait` depends on `SecondTrait` which itself depends on `FirstTrait`.