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An associated item wasn't found in the given type.
Erroneous code example:
```compile_fail,E0576
trait Hello {
type Who;
fn hello() -> <Self as Hello>::You; // error!
}
```
In this example, we tried to use the nonexistent associated type `You` of the
`Hello` trait. To fix this error, use an existing associated type:
```
trait Hello {
type Who;
fn hello() -> <Self as Hello>::Who; // ok!
}
```
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