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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.
25 lines
920 B
Plaintext
25 lines
920 B
Plaintext
error[E0191]: the value of the associated type `Output` in `Add` must be specified
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--> $DIR/issue-21950.rs:10:25
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LL | type Output;
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| ----------- `Output` defined here
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...
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LL | let x = &10 as &dyn Add;
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| ^^^ help: specify the associated type: `Add<Output = Type>`
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error[E0393]: the type parameter `Rhs` must be explicitly specified
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--> $DIR/issue-21950.rs:10:25
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LL | trait Add<Rhs=Self> {
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| ------------------- type parameter `Rhs` must be specified for this
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...
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LL | let x = &10 as &dyn Add;
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| ^^^ help: set the type parameter to the desired type: `Add<Rhs>`
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= note: because of the default `Self` reference, type parameters must be specified on object types
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0191, E0393.
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For more information about an error, try `rustc --explain E0191`.
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