Use derive rather than deriving in tests

src/test/run-pass/expr-block-generic.rs

@@ -23,7 +23,7 @@ fn test_bool() {
     test_generic::<bool>(true, compare_bool);
 }
 
-#[deriving(Clone)]
+#[derive(Clone)]
 struct Pair {
     a: int,
     b: int,