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09f16b596d
Do not attempt to provide an accurate suggestion for `impl Trait` in bare trait types when linting. Instead, only do the object safety check when an E0782 is already going to be emitted in the 2021 edition. Fix #120241.
48 lines
2 KiB
Plaintext
48 lines
2 KiB
Plaintext
error[E0038]: the trait `A` cannot be made into an object
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--> $DIR/avoid-ice-on-warning-3.rs:4:19
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LL | trait B { fn f(a: A) -> A; }
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| ^ `A` 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/avoid-ice-on-warning-3.rs:12:14
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LL | trait A { fn g(b: B) -> B; }
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| - ^ ...because associated function `g` has no `self` parameter
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| this trait cannot be made into an object...
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help: consider turning `g` into a method by giving it a `&self` argument
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LL | trait A { fn g(&self, b: B) -> B; }
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| ++++++
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help: alternatively, consider constraining `g` so it does not apply to trait objects
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LL | trait A { fn g(b: B) -> B where Self: Sized; }
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| +++++++++++++++++
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error[E0038]: the trait `B` cannot be made into an object
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--> $DIR/avoid-ice-on-warning-3.rs:12:19
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LL | trait A { fn g(b: B) -> B; }
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| ^ `B` 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/avoid-ice-on-warning-3.rs:4:14
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LL | trait B { fn f(a: A) -> A; }
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| - ^ ...because associated function `f` has no `self` parameter
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| this trait cannot be made into an object...
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help: consider turning `f` into a method by giving it a `&self` argument
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LL | trait B { fn f(&self, a: A) -> A; }
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| ++++++
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help: alternatively, consider constraining `f` so it does not apply to trait objects
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LL | trait B { fn f(a: A) -> A where Self: Sized; }
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| +++++++++++++++++
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0038`.
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