error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:20:12
   |
20 | 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:34:17
   |
34 |     let mut x = &mut &mut 1u32;
   |                 ^^^^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:29:20
   |
29 |     ($p:expr) => { &mut $p }
   |                    ^^^^^^^
...
49 |     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:36:21
   |
36 |         let mut y = &mut x;
   |                     ^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:40:33
   |
40 |         let y : &mut &mut u32 = &mut &mut 2;
   |                                 ^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:40:17
   |
40 |         let y : &mut &mut u32 = &mut &mut 2;
   |                 ^^^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:45:38
   |
45 |         let y : &mut &mut &mut u32 = &mut &mut &mut 2;
   |                                      ^^^^^^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:45:17
   |
45 |         let y : &mut &mut &mut u32 = &mut &mut &mut 2;
   |                 ^^^^^^^^^^^^^^^^^^

error: generally you want to avoid `&mut &mut _` if possible
  --> $DIR/mut_mut.rs:45:22
   |
45 |         let y : &mut &mut &mut u32 = &mut &mut &mut 2;
   |                      ^^^^^^^^^^^^^

error: aborting due to 9 previous errors