X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;ds=sidebyside;f=src%2Flibcore%2Fiter%2Ftraits%2Fcollect.rs;h=4a90aca148547b81b6003989dfbdcd6c7cb1e361;hb=e4345547b967a1fed4d62f6f0c539b56a2131aa4;hp=da859db545d7ec5f74ec73a043fc15a2c1efeb74;hpb=6700e186883a83008963d1fdba23eff2b1713e56;p=rust.git

diff --git a/src/libcore/iter/traits/collect.rs b/src/libcore/iter/traits/collect.rs
index da859db545d..4a90aca1485 100644
--- a/src/libcore/iter/traits/collect.rs
+++ b/src/libcore/iter/traits/collect.rs
@@ -352,7 +352,9 @@ fn extend_one(&mut self, item: A) {
     ///
     /// The default implementation does nothing.
     #[unstable(feature = "extend_one", issue = "none")]
-    fn extend_reserve(&mut self, _additional: usize) {}
+    fn extend_reserve(&mut self, additional: usize) {
+        let _ = additional;
+    }
 }
 
 #[stable(feature = "extend_for_unit", since = "1.28.0")]