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Rollup merge of #75928 - JulianKnodt:non_utf8, r=estebank

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Remove trait_selection error message in specific case

In the case that a trait is not implemented for an ADT with type errors, cancel the error.

Fixes #75627
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Dylan DPC 2020-10-05 02:29:25 +02:00 • committed by GitHub
commit 5fa978fa1b
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5
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -1907,6 +1907,11 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
ObligationCauseCode::BuiltinDerivedObligation(ref data) => {
let parent_trait_ref = self.resolve_vars_if_possible(&data.parent_trait_ref);
let ty = parent_trait_ref.skip_binder().self_ty();
if parent_trait_ref.references_error() {
err.cancel();
return;
}
err.note(&format!("required because it appears within the type `{}`", ty));
obligated_types.push(ty);