[rustc.git] / compiler / rustc_error_codes / src / error_codes / E0191.md

An associated type wasn't specified for a trait object.

Erroneous code example:

```compile_fail,E0191
trait Trait {
    type Bar;
}

type Foo = dyn 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 = dyn Trait<Bar=i32>; // ok!
```
Commit	Line	Data
dfeec247 XL	1	An associated type wasn't specified for a trait object.
	2
	3	Erroneous code example:
60c5eb7d XL	4
	5	```compile_fail,E0191
	6	trait Trait {
	7	type Bar;
	8	}
	9
781aab86 FG	10	type Foo = dyn Trait; // error: the value of the associated type `Bar` (from
781aab86 FG	11	// the trait `Trait`) must be specified
60c5eb7d XL	12	```
60c5eb7d XL	13
dfeec247 XL	14	Trait objects need to have all associated types specified. Please verify that
	15	all associated types of the trait were specified and the correct trait was used.
	16	Example:
60c5eb7d XL	17
	18	```
	19	trait Trait {
	20	type Bar;
	21	}
	22
781aab86	23	type Foo = dyn Trait<Bar=i32>; // ok!
60c5eb7d	24	```