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8c04999226
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.
94 lines
4.4 KiB
Plaintext
94 lines
4.4 KiB
Plaintext
error[E0107]: method takes 0 generic arguments but 1 generic argument was supplied
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--> $DIR/test-2.rs:9:8
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LL | 10.dup::<i32>();
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| ^^^------- help: remove these generics
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| expected 0 generic arguments
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note: method defined here, with 0 generic parameters
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--> $DIR/test-2.rs:4:16
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LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
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| ^^^
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error[E0107]: method takes 1 generic argument but 2 generic arguments were supplied
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--> $DIR/test-2.rs:11:8
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LL | 10.blah::<i32, i32>();
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| ^^^^ --- help: remove this generic argument
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| expected 1 generic argument
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note: method defined here, with 1 generic parameter: `X`
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--> $DIR/test-2.rs:4:39
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LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
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| ^^^^ -
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error[E0038]: the trait `bar` cannot be made into an object
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--> $DIR/test-2.rs:13:22
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LL | (Box::new(10) as Box<dyn bar>).dup();
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| ^^^^^^^^^^^^ `bar` cannot be made into an object
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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>
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--> $DIR/test-2.rs:4:30
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LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
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| --- ^^^^ ^^^^ ...because method `blah` has generic type parameters
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| | |
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| | ...because method `dup` references the `Self` type in its return type
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| this trait cannot be made into an object...
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= help: consider moving `dup` to another trait
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= help: consider moving `blah` to another trait
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= 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:
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i32
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u32
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error[E0038]: the trait `bar` cannot be made into an object
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--> $DIR/test-2.rs:13:5
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LL | (Box::new(10) as Box<dyn bar>).dup();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `bar` cannot be made into an object
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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>
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--> $DIR/test-2.rs:4:30
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LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
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| --- ^^^^ ^^^^ ...because method `blah` has generic type parameters
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| | |
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| | ...because method `dup` references the `Self` type in its return type
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| this trait cannot be made into an object...
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= help: consider moving `dup` to another trait
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= help: consider moving `blah` to another trait
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= 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:
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i32
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u32
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error[E0038]: the trait `bar` cannot be made into an object
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--> $DIR/test-2.rs:13:6
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LL | (Box::new(10) as Box<dyn bar>).dup();
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| ^^^^^^^^^^^^ `bar` cannot be made into an object
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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>
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--> $DIR/test-2.rs:4:30
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LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
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| --- ^^^^ ^^^^ ...because method `blah` has generic type parameters
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| | |
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| | ...because method `dup` references the `Self` type in its return type
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| this trait cannot be made into an object...
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= help: consider moving `dup` to another trait
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= help: consider moving `blah` to another trait
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= 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:
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i32
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u32
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= note: required for the cast from `Box<{integer}>` to `Box<dyn bar>`
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error: aborting due to 5 previous errors
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Some errors have detailed explanations: E0038, E0107.
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For more information about an error, try `rustc --explain E0038`.
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