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A type dependency cycle has been encountered.
Erroneous code example:
```compile_fail,E0391
trait FirstTrait : SecondTrait {
}
trait SecondTrait : FirstTrait {
}
```
The previous example contains a circular dependency between two traits:
`FirstTrait` depends on `SecondTrait` which itself depends on `FirstTrait`.
See https://rustc-dev-guide.rust-lang.org/overview.html#queries and
https://rustc-dev-guide.rust-lang.org/query.html for more information.
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