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Something other than a struct, variant or union has been used when one was
expected.
Erroneous code example:
```compile_fail,E0574
mod mordor {}
let sauron = mordor { x: () }; // error!
enum Jak {
Daxter { i: isize },
}
let eco = Jak::Daxter { i: 1 };
match eco {
Jak { i } => {} // error!
}
```
In all these errors, a type was expected. For example, in the first error,
we tried to instantiate the `mordor` module, which is impossible. If you want
to instantiate a type inside a module, you can do it as follow:
```
mod mordor {
pub struct TheRing {
pub x: usize,
}
}
let sauron = mordor::TheRing { x: 1 }; // ok!
```
In the second error, we tried to bind the `Jak` enum directly, which is not
possible: you can only bind one of its variants. To do so:
```
enum Jak {
Daxter { i: isize },
}
let eco = Jak::Daxter { i: 1 };
match eco {
Jak::Daxter { i } => {} // ok!
}
```
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