Further silence ? errors

Author: estebank

compiler/rustc_typeck/src/check/fn_ctxt/_impl.rs

@@ -811,7 +811,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             match lang_item {
                 hir::LangItem::FuturePoll => ObligationCauseCode::AwaitableExpr,
                 hir::LangItem::IntoIterIntoIter => ObligationCauseCode::ForLoopIterator,
-                hir::LangItem::TryTraitBranch => ObligationCauseCode::QuestionMark,
+                hir::LangItem::TryTraitFromResidual | hir::LangItem::TryTraitBranch => {
+                    ObligationCauseCode::QuestionMark
+                }
                 _ => traits::ItemObligation(def_id),
             },
         );