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An associated type wasn't specified for a trait object.
Erroneous code example:
```compile_fail,E0191
trait Trait {
type Bar;
}
type Foo = Trait; // error: the value of the associated type `Bar` (from
// the trait `Trait`) must be specified
```
Trait objects need to have all associated types specified. Please verify that
all associated types of the trait were specified and the correct trait was used.
Example:
```
trait Trait {
type Bar;
}
type Foo = Trait<Bar=i32>; // ok!
```
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