From 737dec0ec16b2606380ed73166b82e44be080ab5 Mon Sep 17 00:00:00 2001
From: varkor <github@varkor.com>
Date: Mon, 19 Nov 2018 18:54:52 +0000
Subject: [PATCH] Fix change to predicates

---
 src/librustc_lint/unused.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc_lint/unused.rs b/src/librustc_lint/unused.rs
index 906579a1ae054..fab618d9c8ec8 100644
--- a/src/librustc_lint/unused.rs
+++ b/src/librustc_lint/unused.rs
@@ -68,7 +68,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnusedResults {
                 ty::Adt(def, _) => check_must_use(cx, def.did, s.span, "", ""),
                 ty::Opaque(def, _) => {
                     let mut must_use = false;
-                    for (predicate, _) in cx.tcx.predicates_of(def).predicates {
+                    for (predicate, _) in &cx.tcx.predicates_of(def).predicates {
                         if let ty::Predicate::Trait(ref poly_trait_predicate) = predicate {
                             let trait_ref = poly_trait_predicate.skip_binder().trait_ref;
                             if check_must_use(cx, trait_ref.def_id, s.span, "implementer of ", "") {