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Never say "Trait is implemented for {type error}" #121803

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Merged
merged 1 commit into from
Mar 2, 2024
Merged

Never say "Trait is implemented for {type error}" #121803

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6 changes: 5 additions & 1 deletion compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1908,6 +1908,9 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
ct_op: |ct| ct.normalize(self.tcx, ty::ParamEnv::empty()),
},
);
if cand.references_error() {
return false;
}
err.highlighted_help(vec![
StringPart::normal(format!("the trait `{}` ", cand.print_trait_sugared())),
StringPart::highlighted("is"),
Expand All @@ -1932,7 +1935,8 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}

let other = if other { "other " } else { "" };
let report = |candidates: Vec<TraitRef<'tcx>>, err: &mut Diag<'_>| {
let report = |mut candidates: Vec<TraitRef<'tcx>>, err: &mut Diag<'_>| {
candidates.retain(|tr| !tr.references_error());
if candidates.is_empty() {
return false;
}
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2 changes: 0 additions & 2 deletions tests/ui/associated-consts/issue-105330.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,6 @@ error[E0277]: the trait bound `Demo: TraitWAssocConst` is not satisfied
LL | foo::<Demo>()();
| ^^^^ the trait `TraitWAssocConst` is not implemented for `Demo`
|
= help: the trait `TraitWAssocConst` is implemented for `{type error}`
note: required by a bound in `foo`
--> $DIR/issue-105330.rs:11:11
|
Expand Down Expand Up @@ -92,7 +91,6 @@ error[E0277]: the trait bound `Demo: TraitWAssocConst` is not satisfied
LL | foo::<Demo>();
| ^^^^ the trait `TraitWAssocConst` is not implemented for `Demo`
|
= help: the trait `TraitWAssocConst` is implemented for `{type error}`
note: required by a bound in `foo`
--> $DIR/issue-105330.rs:11:11
|
Expand Down