Fix std tests

Author: rylev

library/std/src/collections/hash/map/tests.rs

@@ -774,11 +774,11 @@ fn test_occupied_entry_key() {
     let key = "hello there";
     let value = "value goes here";
     assert!(a.is_empty());
-    a.insert(key.clone(), value.clone());
+    a.insert(key, value);
     assert_eq!(a.len(), 1);
     assert_eq!(a[key], value);
 
-    match a.entry(key.clone()) {
+    match a.entry(key) {
         Vacant(_) => panic!(),
         Occupied(e) => assert_eq!(key, *e.key()),
     }
@@ -793,11 +793,11 @@ fn test_vacant_entry_key() {
     let value = "value goes here";
 
     assert!(a.is_empty());
-    match a.entry(key.clone()) {
+    match a.entry(key) {
         Occupied(_) => panic!(),
         Vacant(e) => {
             assert_eq!(key, *e.key());
-            e.insert(value.clone());
+            e.insert(value);
         }
     }
     assert_eq!(a.len(), 1);