treemap: get rid of some implicit vector copies

Author: thestinger

src/libstd/treemap.rs

@@ -745,8 +745,8 @@ mod test_treemap {
         let v1 = str::to_bytes(~"baz");
         let v2 = str::to_bytes(~"foobar");
 
-        m.insert(k1, v1);
-        m.insert(k2, v2);
+        m.insert(copy k1, copy v1);
+        m.insert(copy k2, copy v2);
 
         assert m.find(&k2) == Some(&v2);
         assert m.find(&k1) == Some(&v1);