Fix warning

rust-lang · Nov 26, 2018 · 03db6f4 · 03db6f4
1 parent cfd3225
commit 03db6f4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/libstd/collections/hash/map.rs b/src/libstd/collections/hash/map.rs
@@ -409,7 +409,7 @@ impl<K, V, S> HashMap<K, V, S>
     /// map.try_reserve(10).expect("why is the test harness OOMing on 10 bytes?");
     /// ```
     #[unstable(feature = "try_reserve", reason = "new API", issue="48043")]
-    pub fn try_reserve(&mut self, additional: usize) -> Result<(), CollectionAllocErr> {
+    pub fn try_reserve(&mut self, _additional: usize) -> Result<(), CollectionAllocErr> {
         unimplemented!()
     }