Fix tests

tests/compile-fail/for_loop.rs

@@ -16,7 +16,7 @@ impl Unrelated {
 
 #[deny(needless_range_loop, explicit_iter_loop, iter_next_loop, reverse_range_loop, explicit_counter_loop)]
 #[deny(unused_collect)]
-#[allow(linkedlist,shadow_unrelated)]
+#[allow(linkedlist,shadow_unrelated,unnecessary_mut_passed)]
 fn main() {
     let mut vec = vec![1, 2, 3, 4];
     let vec2 = vec![1, 2, 3, 4];

tests/compile-fail/mut_reference.rs

@@ -1,9 +1,12 @@
 #![feature(plugin)]
 #![plugin(clippy)]
 
+#![allow(unused_variable)]
+
 fn takes_an_immutable_reference(a: &i32) {
 }
 
+
 fn takes_a_mutable_reference(a: &mut i32) {
 }
 
@@ -32,7 +35,7 @@ fn main() {
     // Functions
     takes_an_immutable_reference(&42);
     takes_a_mutable_reference(&mut 42);
-    let mut a = &mut 42;
+    let a = &mut 42;
     takes_an_immutable_reference(a);
     
     // Methods