rust/tests/ui/suggestions/trait-hidden-method.stderr
Esteban Küber 17a6ae2df3 Detect object safety errors when assoc type is missing
When an associated type with GATs isn't specified in a `dyn Trait`, emit
an object safety error instead of only complaining about the missing
associated type, as it will lead the user down a path of three different
errors before letting them know that what they were trying to do is
impossible to begin with.

Fix #103155.
2023-10-30 22:12:07 +00:00

25 lines
1.3 KiB
Plaintext

error[E0191]: the value of the associated type `Item` in `Iterator` must be specified
--> $DIR/trait-hidden-method.rs:6:33
|
LL | Box::new(1..=10) as Box<dyn Iterator>
| ^^^^^^^^ help: specify the associated type: `Iterator<Item = Type>`
error[E0271]: expected `Box<dyn Iterator>` to be an iterator that yields `u32`, but it yields `<dyn Iterator as Iterator>::Item`
--> $DIR/trait-hidden-method.rs:3:32
|
LL | pub fn i_can_has_iterator() -> impl Iterator<Item = u32> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^ expected associated type, found `u32`
...
LL | Box::new(1..=10) as Box<dyn Iterator>
| ------------------------------------- return type was inferred to be `Box<dyn Iterator>` here
|
= note: expected associated type `<dyn Iterator as Iterator>::Item`
found type `u32`
= help: consider constraining the associated type `<dyn Iterator as Iterator>::Item` to `u32` or calling a method that returns `<dyn Iterator as Iterator>::Item`
= note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0191, E0271.
For more information about an error, try `rustc --explain E0191`.