| ObligationCauseCode::ObjectCastObligation(..)
| ObligationCauseCode::OpaqueType
);
- let expected_ty = data.term.ty().unwrap();
+ let expected_ty = data.term.ty().unwrap_or_else(|| self.tcx.ty_error());
// constrain inference variables a bit more to nested obligations from normalize so
// we can have more helpful errors.
&self,
trait_pred: ty::PolyTraitPredicate<'tcx>,
) -> Vec<ImplCandidate<'tcx>> {
- self.tcx
+ let mut candidates: Vec<_> = self
+ .tcx
.all_impls(trait_pred.def_id())
.filter_map(|def_id| {
if self.tcx.impl_polarity(def_id) == ty::ImplPolarity::Negative
self.fuzzy_match_tys(trait_pred.skip_binder().self_ty(), imp.self_ty(), false)
.map(|similarity| ImplCandidate { trait_ref: imp, similarity })
})
- .collect()
+ .collect();
+ if candidates.iter().any(|c| matches!(c.similarity, CandidateSimilarity::Exact { .. })) {
+ // If any of the candidates is a perfect match, we don't want to show all of them.
+ // This is particularly relevant for the case of numeric types (as they all have the
+ // same cathegory).
+ candidates.retain(|c| matches!(c.similarity, CandidateSimilarity::Exact { .. }));
+ }
+ candidates
}
fn report_similar_impl_candidates(