f0c93117ed
When encountering trait bound errors that satisfy some heuristics that tell us that the relevant trait for the user comes from the root obligation and not the current obligation, we use the root predicate for the main message. This allows to talk about "X doesn't implement Pattern<'_>" over the most specific case that just happened to fail, like "char doesn't implement Fn(&mut char)" in `tests/ui/traits/suggest-dereferences/root-obligation.rs` The heuristics are: - the type of the leaf predicate is (roughly) the same as the type from the root predicate, as a proxy for "we care about the root" - the leaf trait and the root trait are different, so as to avoid talking about `&mut T: Trait` and instead remain talking about `T: Trait` instead - the root trait is not `Unsize`, as to avoid talking about it in `tests/ui/coercion/coerce-issue-49593-box-never.rs`. ``` error[E0277]: the trait bound `&char: Pattern<'_>` is not satisfied --> $DIR/root-obligation.rs:6:38 | LL | .filter(|c| "aeiou".contains(c)) | -------- ^ the trait `Fn<(char,)>` is not implemented for `&char`, which is required by `&char: Pattern<'_>` | | | required by a bound introduced by this call | = note: required for `&char` to implement `FnOnce<(char,)>` = note: required for `&char` to implement `Pattern<'_>` note: required by a bound in `core::str::<impl str>::contains` --> $SRC_DIR/core/src/str/mod.rs:LL:COL help: consider dereferencing here | LL | .filter(|c| "aeiou".contains(*c)) | + ``` Fix #79359, fix #119983, fix #118779, cc #118415 (the suggestion needs to change).
37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
error[E0568]: auto traits cannot have super traits or lifetime bounds
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--> $DIR/supertrait-auto-trait.rs:8:17
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LL | auto trait Magic: Copy {}
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| -----^^^^^^ help: remove the super traits or lifetime bounds
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| auto traits cannot have super traits or lifetime bounds
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error[E0277]: the trait bound `NoClone: Magic` is not satisfied
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--> $DIR/supertrait-auto-trait.rs:16:23
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LL | let (a, b) = copy(NoClone);
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| ---- ^^^^^^^ the trait `Copy` is not implemented for `NoClone`, which is required by `NoClone: Magic`
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| required by a bound introduced by this call
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note: required for `NoClone` to implement `Magic`
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--> $DIR/supertrait-auto-trait.rs:8:12
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LL | auto trait Magic: Copy {}
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| ^^^^^
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note: required by a bound in `copy`
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--> $DIR/supertrait-auto-trait.rs:10:12
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LL | fn copy<T: Magic>(x: T) -> (T, T) { (x, x) }
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| ^^^^^ required by this bound in `copy`
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help: consider annotating `NoClone` with `#[derive(Copy)]`
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LL + #[derive(Copy)]
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LL | struct NoClone;
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0277, E0568.
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For more information about an error, try `rustc --explain E0277`.
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