---

yaml
---
r: 186064
b: refs/heads/auto
c: f38b83b
h: refs/heads/master
v: v3

Author: Ms2ger

[refs]

@@ -10,7 +10,7 @@ refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503
 refs/tags/release-0.3.1: 495bae036dfe5ec6ceafd3312b4dca48741e845b
 refs/tags/release-0.4: e828ea2080499553b97dfe33b3f4d472b4562ad7
 refs/tags/release-0.5: 7e3bcfbf21278251ee936ad53e92e9b719702d73
-refs/heads/auto: 2a37f7f07ca6bc3e3f19c6bb33b25bbc35f561a2
+refs/heads/auto: f38b83b3609b060df5ab3d2a57e98020b8b29efb
 refs/heads/servo: af82457af293e2a842ba6b7759b70288da276167
 refs/tags/release-0.6: b4ebcfa1812664df5e142f0134a5faea3918544c
 refs/tags/0.1: b19db808c2793fe2976759b85a355c3ad8c8b336

branches/auto/src/librustc_lint/builtin.rs

@@ -741,23 +741,24 @@ impl LintPass for UnusedResults {
         }
 
         let t = ty::expr_ty(cx.tcx, expr);
-        let mut warned = false;
-        match t.sty {
+        let warned = match t.sty {
             ty::ty_tup(ref tys) if tys.is_empty() => return,
             ty::ty_bool => return,
             ty::ty_struct(did, _) |
             ty::ty_enum(did, _) => {
                 if ast_util::is_local(did) {
                     if let ast_map::NodeItem(it) = cx.tcx.map.get(did.node) {
-                        warned |= check_must_use(cx, &it.attrs, s.span);
+                        check_must_use(cx, &it.attrs, s.span)
+                    } else {
+                        false
                     }
                 } else {
                     let attrs = csearch::get_item_attrs(&cx.sess().cstore, did);
-                    warned |= check_must_use(cx, &attrs[..], s.span);
+                    check_must_use(cx, &attrs[..], s.span)
                 }
             }
-            _ => {}
-        }
+            _ => false,
+        };
         if !warned {
             cx.span_lint(UNUSED_RESULTS, s.span, "unused result");
         }