rust/tests/ui/traits/test-2.stderr
Esteban Küber 8c04999226 On object safety error, mention new enum as alternative
When we encounter a `dyn Trait` that isn't object safe, look for its
implementors. If there's one, mention using it directly If there are
less than 9, mention the possibility of creating a new enum and using
that instead.

Account for object unsafe `impl Trait on dyn Trait {}`.  Make a
distinction between public and sealed traits.

Fix #80194.
2023-10-29 23:55:46 +00:00

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error[E0107]: method takes 0 generic arguments but 1 generic argument was supplied
--> $DIR/test-2.rs:9:8
|
LL | 10.dup::<i32>();
| ^^^------- help: remove these generics
| |
| expected 0 generic arguments
|
note: method defined here, with 0 generic parameters
--> $DIR/test-2.rs:4:16
|
LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
| ^^^
error[E0107]: method takes 1 generic argument but 2 generic arguments were supplied
--> $DIR/test-2.rs:11:8
|
LL | 10.blah::<i32, i32>();
| ^^^^ --- help: remove this generic argument
| |
| expected 1 generic argument
|
note: method defined here, with 1 generic parameter: `X`
--> $DIR/test-2.rs:4:39
|
LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
| ^^^^ -
error[E0038]: the trait `bar` cannot be made into an object
--> $DIR/test-2.rs:13:22
|
LL | (Box::new(10) as Box<dyn bar>).dup();
| ^^^^^^^^^^^^ `bar` 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>
--> $DIR/test-2.rs:4:30
|
LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
| --- ^^^^ ^^^^ ...because method `blah` has generic type parameters
| | |
| | ...because method `dup` references the `Self` type in its return type
| this trait cannot be made into an object...
= help: consider moving `dup` to another trait
= help: consider moving `blah` to another trait
= help: the following types implement the trait, consider defining an enum where each variant holds one of these types, implementing `bar` for this new enum and using it instead:
i32
u32
error[E0038]: the trait `bar` cannot be made into an object
--> $DIR/test-2.rs:13:5
|
LL | (Box::new(10) as Box<dyn bar>).dup();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `bar` 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>
--> $DIR/test-2.rs:4:30
|
LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
| --- ^^^^ ^^^^ ...because method `blah` has generic type parameters
| | |
| | ...because method `dup` references the `Self` type in its return type
| this trait cannot be made into an object...
= help: consider moving `dup` to another trait
= help: consider moving `blah` to another trait
= help: the following types implement the trait, consider defining an enum where each variant holds one of these types, implementing `bar` for this new enum and using it instead:
i32
u32
error[E0038]: the trait `bar` cannot be made into an object
--> $DIR/test-2.rs:13:6
|
LL | (Box::new(10) as Box<dyn bar>).dup();
| ^^^^^^^^^^^^ `bar` 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>
--> $DIR/test-2.rs:4:30
|
LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
| --- ^^^^ ^^^^ ...because method `blah` has generic type parameters
| | |
| | ...because method `dup` references the `Self` type in its return type
| this trait cannot be made into an object...
= help: consider moving `dup` to another trait
= help: consider moving `blah` to another trait
= help: the following types implement the trait, consider defining an enum where each variant holds one of these types, implementing `bar` for this new enum and using it instead:
i32
u32
= note: required for the cast from `Box<{integer}>` to `Box<dyn bar>`
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0038, E0107.
For more information about an error, try `rustc --explain E0038`.