Keep error types around, even in obligations.

These help silence follow up errors

compiler/rustc_infer/src/infer/opaque_types.rs

@@ -631,13 +631,6 @@ impl<'tcx> InferCtxt<'tcx> {
                 ct_op: |ct| ct,
             });
 
-            if let ty::ClauseKind::Projection(projection) = predicate.kind().skip_binder() {
-                if projection.term.references_error() {
-                    // No point on adding any obligations since there's a type error involved.
-                    obligations.clear();
-                    return;
-                }
-            }
             // Require that the predicate holds for the concrete type.
             debug!(?predicate);
             obligations.push(traits::Obligation::new(