Add ugly suggestion test

Author: tesuji

tests/ui/zero_ptr.rs

@@ -5,6 +5,10 @@ fn main() {
     let _ = 0 as *mut f64;
     let _: *const u8 = 0 as *const _;
 
+    // FIXME: ugly suggestion
+    #[rustfmt::skip]
+    let _ = 0 as *     const   usize;
+
     foo(0 as _, 0 as _);
     foo(0 as *const _, 0 as *mut _);
 

tests/ui/zero_ptr.stderr

@@ -19,16 +19,22 @@ LL |     let _: *const u8 = 0 as *const _;
    |                        ^^^^^^^^^^^^^ help: try: `std::ptr::null()`
 
 error: `0 as *const _` detected
-  --> $DIR/zero_ptr.rs:9:9
+  --> $DIR/zero_ptr.rs:10:13
+   |
+LL |     let _ = 0 as *     const   usize;
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `std::ptr::null::<*     const   usize>()`
+
+error: `0 as *const _` detected
+  --> $DIR/zero_ptr.rs:13:9
    |
 LL |     foo(0 as *const _, 0 as *mut _);
    |         ^^^^^^^^^^^^^ help: try: `std::ptr::null()`
 
 error: `0 as *mut _` detected
-  --> $DIR/zero_ptr.rs:9:24
+  --> $DIR/zero_ptr.rs:13:24
    |
 LL |     foo(0 as *const _, 0 as *mut _);
    |                        ^^^^^^^^^^^ help: try: `std::ptr::null_mut()`
 
-error: aborting due to 5 previous errors
+error: aborting due to 6 previous errors