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An associated type whose name does not match any of the associated types
in the trait was used when implementing the trait.
Erroneous code example:
```compile_fail,E0437
trait Foo {}
impl Foo for i32 {
type Bar = bool;
}
```
Trait implementations can only implement associated types that are members of
the trait in question.
The solution to this problem is to remove the extraneous associated type:
```
trait Foo {}
impl Foo for i32 {}
```
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