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Fixed #85845: Added a note in E0369 if the missing trait is PartialEq #85929

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Fixed #85845: Added a note in E0369 if the missing trait is PartialEq #85929

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518f643
Added a note in E0369 if the missing trait is PartialEq to use the de…
ccgauche Jun 2, 2021
01996be
Updated the fix for #85845
ccgauche Aug 1, 2021
a1d18be
Removed unused contains
ccgauche Aug 1, 2021
96c4539
Fixed error unit test + Added correction for PartialOrd
ccgauche Aug 1, 2021
bcb49dc
Fixed CI 2
ccgauche Aug 1, 2021
afcef43
Fixed derives-span-PartialEq-enum tests
ccgauche Aug 2, 2021
38830d2
Replaced String checks with enums so we can ensure that everything wi…
ccgauche Aug 17, 2021
b58393b
Fixed CI errors
ccgauche Aug 17, 2021
207f9b1
Fixed borrow issue
ccgauche Aug 17, 2021
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7 changes: 7 additions & 0 deletions compiler/rustc_typeck/src/check/op.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -959,6 +959,13 @@ fn suggest_impl_missing(err: &mut DiagnosticBuilder<'_>, ty: Ty<'_>, missing_tra
"an implementation of `{}` might be missing for `{}`",
missing_trait, ty
));
// This checks if the missing trait is PartialEq to suggest adding a derive
if missing_trait.ends_with("PartialEq") {
err.note(&format!(
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Use span_suggestion, as this is a suggestion. You should move this to somewhere else, so you can look up the span of the original definition for the type.

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I'm not sure that a span suggestion is better. A note at the end is clearer. Why do you want a span_suggestion?

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Because you want to suggest adding a derive to the type being compared here. So you use the span of the original definition and add a #[derive(PartialEq)] on top of it, or add PartialEq to the existing derive.

"add `#[derive(PartialEq)]` or manually implement `PartialEq` for `{}`",
ty
));
}
}
}
}
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