more test

Author: lengyijun

tests/ui/needless_deref.rs

@@ -10,7 +10,8 @@ mod should_lint {
     }
 }
 
-mod should_not_lint {
+// this mod explains why we should not lint `&mut &* (&T)`
+mod should_not_lint1 {
     fn foo(x: &mut &u32) {
         *x = &1;
     }
@@ -24,3 +25,14 @@ mod should_not_lint {
         assert_eq!(*x, 1);
     }
 }
+
+// this mod explains why we should not lint `& &* (&T)`
+mod should_not_lint2 {
+    fn foo() {
+        let x = &12;
+        let addr_x = &x as *const _ as usize;
+        let addr_y = &&*x as *const _ as usize; // assert ok
+        // let addr_y = &x as *const _ as usize; // assert fail
+        assert_ne!(addr_x, addr_y);
+    }
+}