error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:7:11
   |
LL | fn foo(s: &mut Vec<u32>, b: &u32, x: &mut u32) {
   |           ^^^^^^^^^^^^^ help: consider changing to: `&Vec<u32>`
   |
   = note: `-D clippy::needless-pass-by-ref-mut` implied by `-D warnings`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:32:12
   |
LL | fn foo6(s: &mut Vec<u32>) {
   |            ^^^^^^^^^^^^^ help: consider changing to: `&Vec<u32>`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:45:29
   |
LL |     fn mushroom(&self, vec: &mut Vec<i32>) -> usize {
   |                             ^^^^^^^^^^^^^ help: consider changing to: `&Vec<i32>`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:50:31
   |
LL |     fn badger(&mut self, vec: &mut Vec<i32>) -> usize {
   |                               ^^^^^^^^^^^^^ help: consider changing to: `&Vec<i32>`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:127:16
   |
LL | async fn a1(x: &mut i32) {
   |                ^^^^^^^^ help: consider changing to: `&i32`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:131:16
   |
LL | async fn a2(x: &mut i32, y: String) {
   |                ^^^^^^^^ help: consider changing to: `&i32`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:135:16
   |
LL | async fn a3(x: &mut i32, y: String, z: String) {
   |                ^^^^^^^^ help: consider changing to: `&i32`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:139:16
   |
LL | async fn a4(x: &mut i32, y: i32) {
   |                ^^^^^^^^ help: consider changing to: `&i32`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:143:24
   |
LL | async fn a5(x: i32, y: &mut i32) {
   |                        ^^^^^^^^ help: consider changing to: `&i32`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:147:24
   |
LL | async fn a6(x: i32, y: &mut i32) {
   |                        ^^^^^^^^ help: consider changing to: `&i32`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:151:32
   |
LL | async fn a7(x: i32, y: i32, z: &mut i32) {
   |                                ^^^^^^^^ help: consider changing to: `&i32`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:155:24
   |
LL | async fn a8(x: i32, a: &mut i32, y: i32, z: &mut i32) {
   |                        ^^^^^^^^ help: consider changing to: `&i32`

error: this argument is a mutable reference, but not used mutably
  --> $DIR/needless_pass_by_ref_mut.rs:155:45
   |
LL | async fn a8(x: i32, a: &mut i32, y: i32, z: &mut i32) {
   |                                             ^^^^^^^^ help: consider changing to: `&i32`

error: aborting due to 13 previous errors