error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:13:11
   |
13 | fn fun(x: &mut &mut u32) -> bool {
   |           ^^^^^^^^^^^^^
   |
   = note: `-D clippy::mut-mut` implied by `-D warnings`

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:29:17
   |
29 |     let mut x = &mut &mut 1u32;
   |                 ^^^^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:23:9
   |
23 |         &mut $p
   |         ^^^^^^^
...
44 |     let mut z = mut_ptr!(&mut 3u32);
   |                 ------------------- in this macro invocation

error: this expression mutably borrows a mutable reference. Consider reborrowing
  --> $DIR/mut_mut.rs:31:21
   |
31 |         let mut y = &mut x;
   |                     ^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:35:32
   |
35 |         let y: &mut &mut u32 = &mut &mut 2;
   |                                ^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:35:16
   |
35 |         let y: &mut &mut u32 = &mut &mut 2;
   |                ^^^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:40:37
   |
40 |         let y: &mut &mut &mut u32 = &mut &mut &mut 2;
   |                                     ^^^^^^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:40:16
   |
40 |         let y: &mut &mut &mut u32 = &mut &mut &mut 2;
   |                ^^^^^^^^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:40:21
   |
40 |         let y: &mut &mut &mut u32 = &mut &mut &mut 2;
   |                     ^^^^^^^^^^^^^

error: aborting due to 9 previous errors