Improve "associated type not found" diagnostics #115662
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| | ^^^^ associated type `Item` not found | ||
| | ^^^^ | ||
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| = help: `M` has no associated type, try removing `Item` |
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This suggestion doesn't make sense imo.
| return err.emit(); | ||
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| let msg = if all_candidate_names.len() > 1 { |
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I don't think we should suggest anything if there's >1 candidate.
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trait Qux {
type A;
type B;
}
fn quux<T>() where T: Qux<A = u32, ZZ = u32> {}gives
error[E0220]: associated type `ZZ` not found for `Qux`
--> E0220.rs:14:36
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14 | fn quux<T>() where T: Qux<A = u32, ZZ = u32> {}
| ^^
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help: `Qux` has the following associated types
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14 | fn quux<T>() where T: Qux<A = u32, A = u32> {}
| ~
14 | fn quux<T>() where T: Qux<A = u32, B = u32> {}
| ~
I think this is still helpful?
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…iaskrgr Rollup of 5 pull requests Successful merges: - rust-lang#113807 (Tests crash from inappropriate use of common linkage) - rust-lang#115358 (debuginfo: add compiler option to allow compressed debuginfo sections) - rust-lang#115630 (Dont suggest use between `use` and cfg attr) - rust-lang#115662 (Improve "associated type not found" diagnostics) - rust-lang#115673 (Fix sanitize/cfg.rs test) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#115662 - ShE3py:E0220-note, r=compiler-errors Improve "associated type not found" diagnostics ```rs use core::ops::Deref; fn foo<T>() where T: Deref<Output = u32> {} ``` Before: ``` error[E0220]: associated type `Output` not found for `Deref` --> E0220.rs:5:28 | 5 | fn foo<T>() where T: Deref<Output = u32> {} | ^^^^^^ associated type `Output` not found ``` After: ``` error[E0220]: associated type `Output` not found for `Deref` --> E0220.rs:5:28 | 5 | fn foo<T>() where T: Deref<Output = u32> {} | ^^^^^^ help: `Deref` has the following associated type: `Target` ``` --- `@rustbot` label +A-diagnostics +D-papercut
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@rustbot label +A-diagnostics +D-papercut