rust/src/test/ui/traits/trait-alias/trait-alias-object-fail.stderr

error[E0038]: the trait `Eq` cannot be made into an object
  --> $DIR/trait-alias-object-fail.rs:7:13
   |
LL |     let _: &dyn EqAlias = &123;
   |             ^^^^^^^^^^^ the trait `Eq` cannot be made into an object
   |
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  --> $SRC_DIR/core/src/cmp.rs:LL:COL
   |
LL | pub trait Eq: PartialEq<Self> {
   |               ^^^^^^^^^^^^^^^ the trait cannot be made into an object because it uses `Self` as a type parameter in this

error[E0191]: the value of the associated type `Item` (from trait `Iterator`) must be specified
  --> $DIR/trait-alias-object-fail.rs:9:17
   |
LL |     let _: &dyn IteratorAlias = &vec![123].into_iter();
   |                 ^^^^^^^^^^^^^ help: specify the associated type: `IteratorAlias<Item = Type>`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0038, E0191.
For more information about an error, try `rustc --explain E0038`.
pretty: trim paths of unique symbols If a symbol name can only be imported from one place for a type, and as long as it was not glob-imported anywhere in the current crate, we can trim its printed path and print only the name. This has wide implications on error messages with types, for example, shortening `std::vec::Vec` to just `Vec`, as long as there is no other `Vec` importable anywhere. This adds a new '-Z trim-diagnostic-paths=false' option to control this feature. On the good path, with no diagnosis printed, we should try to avoid issuing this query, so we need to prevent trimmed_def_paths query on several cases. This change also relies on a previous commit that differentiates between `Debug` and `Display` on various rustc types, where the latter is trimmed and presented to the user and the former is not. 2020-09-02 07:40:56 +00:00			error[E0038]: the trait `Eq` cannot be made into an object
tests: remove ignore directives from tests that mention core/alloc/std spans. 2020-04-01 01:10:13 +00:00			`--> $DIR/trait-alias-object-fail.rs:7:13`
Added WF checking for trait alias definitions. 2018-11-01 18:17:58 +00:00			`\|`
Update tests 2019-03-09 12:03:44 +00:00			`LL \| let _: &dyn EqAlias = &123;`
pretty: trim paths of unique symbols If a symbol name can only be imported from one place for a type, and as long as it was not glob-imported anywhere in the current crate, we can trim its printed path and print only the name. This has wide implications on error messages with types, for example, shortening `std::vec::Vec` to just `Vec`, as long as there is no other `Vec` importable anywhere. This adds a new '-Z trim-diagnostic-paths=false' option to control this feature. On the good path, with no diagnosis printed, we should try to avoid issuing this query, so we need to prevent trimmed_def_paths query on several cases. This change also relies on a previous commit that differentiates between `Debug` and `Display` on various rustc types, where the latter is trimmed and presented to the user and the former is not. 2020-09-02 07:40:56 +00:00			\| ^^^^^^^^^^^ the trait `Eq` cannot be made into an object
Tweak "object unsafe" errors Fix #77598. 2020-10-16 00:23:45 +00:00			`\|`
			`note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>`
			`--> $SRC_DIR/core/src/cmp.rs:LL:COL`
Added WF checking for trait alias definitions. 2018-11-01 18:17:58 +00:00			`\|`
Point at reason in object unsafe trait with `Self` in supertraits or `where`-clause 2020-02-02 20:51:30 +00:00			`LL \| pub trait Eq: PartialEq<Self> {`
Tweak "object unsafe" errors Fix #77598. 2020-10-16 00:23:45 +00:00			\| ^^^^^^^^^^^^^^^ the trait cannot be made into an object because it uses `Self` as a type parameter in this
Added WF checking for trait alias definitions. 2018-11-01 18:17:58 +00:00
pretty: trim paths of unique symbols If a symbol name can only be imported from one place for a type, and as long as it was not glob-imported anywhere in the current crate, we can trim its printed path and print only the name. This has wide implications on error messages with types, for example, shortening `std::vec::Vec` to just `Vec`, as long as there is no other `Vec` importable anywhere. This adds a new '-Z trim-diagnostic-paths=false' option to control this feature. On the good path, with no diagnosis printed, we should try to avoid issuing this query, so we need to prevent trimmed_def_paths query on several cases. This change also relies on a previous commit that differentiates between `Debug` and `Display` on various rustc types, where the latter is trimmed and presented to the user and the former is not. 2020-09-02 07:40:56 +00:00			error[E0191]: the value of the associated type `Item` (from trait `Iterator`) must be specified
tests: remove ignore directives from tests that mention core/alloc/std spans. 2020-04-01 01:10:13 +00:00			`--> $DIR/trait-alias-object-fail.rs:9:17`
Added WF checking for trait alias definitions. 2018-11-01 18:17:58 +00:00			`\|`
Update tests 2019-03-09 12:03:44 +00:00			`LL \| let _: &dyn IteratorAlias = &vec![123].into_iter();`
Tweak errors for missing associated types and type parameters 2019-12-12 22:48:46 +00:00			\| ^^^^^^^^^^^^^ help: specify the associated type: `IteratorAlias<Item = Type>`
Added WF checking for trait alias definitions. 2018-11-01 18:17:58 +00:00
			`error: aborting due to 2 previous errors`

hide `--explain` hint if error has no extended info 2019-04-17 17:26:38 +00:00			`Some errors have detailed explanations: E0038, E0191.`
Added WF checking for trait alias definitions. 2018-11-01 18:17:58 +00:00			For more information about an error, try `rustc --explain E0038`.