17a6ae2df3
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.
22 lines
1003 B
Plaintext
22 lines
1003 B
Plaintext
error[E0038]: the trait `Eq` cannot be made into an object
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--> $DIR/object-fail.rs:7:13
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LL | let _: &dyn EqAlias = &123;
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| ^^^^^^^^^^^ `Eq` 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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--> $SRC_DIR/core/src/cmp.rs:LL:COL
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= note: the trait cannot be made into an object because it uses `Self` as a type parameter
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error[E0191]: the value of the associated type `Item` in `Iterator` must be specified
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--> $DIR/object-fail.rs:9:17
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LL | let _: &dyn IteratorAlias = &vec![123].into_iter();
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| ^^^^^^^^^^^^^ help: specify the associated type: `IteratorAlias<Item = Type>`
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0038, E0191.
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For more information about an error, try `rustc --explain E0038`.
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