error: the function `takes_ref` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:56:15
   |
LL |     takes_ref(&mut 42);
   |               ^^^^^^^ help: remove this `mut`: `&42`
   |
   = note: `-D clippy::unnecessary-mut-passed` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::unnecessary_mut_passed)]`

error: the function `takes_ref_ref` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:58:19
   |
LL |     takes_ref_ref(&mut &42);
   |                   ^^^^^^^^ help: remove this `mut`: `&&42`

error: the function `takes_ref_refmut` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:60:22
   |
LL |     takes_ref_refmut(&mut &mut 42);
   |                      ^^^^^^^^^^^^ help: remove this `mut`: `&&mut 42`

error: the function `takes_raw_const` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:62:21
   |
LL |     takes_raw_const(&mut 42);
   |                     ^^^^^^^ help: remove this `mut`: `&42`

error: the function `as_ptr` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:66:12
   |
LL |     as_ptr(&mut 42);
   |            ^^^^^^^ help: remove this `mut`: `&42`

error: the function `as_ptr` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:69:12
   |
LL |     as_ptr(&mut &42);
   |            ^^^^^^^^ help: remove this `mut`: `&&42`

error: the function `as_ptr` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:72:12
   |
LL |     as_ptr(&mut &mut 42);
   |            ^^^^^^^^^^^^ help: remove this `mut`: `&&mut 42`

error: the function `as_ptr` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:75:12
   |
LL |     as_ptr(&mut 42);
   |            ^^^^^^^ help: remove this `mut`: `&42`

error: the method `takes_ref` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:80:25
   |
LL |     my_struct.takes_ref(&mut 42);
   |                         ^^^^^^^ help: remove this `mut`: `&42`

error: the method `takes_ref_ref` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:82:29
   |
LL |     my_struct.takes_ref_ref(&mut &42);
   |                             ^^^^^^^^ help: remove this `mut`: `&&42`

error: the method `takes_ref_refmut` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:84:32
   |
LL |     my_struct.takes_ref_refmut(&mut &mut 42);
   |                                ^^^^^^^^^^^^ help: remove this `mut`: `&&mut 42`

error: the method `takes_raw_const` doesn't need a mutable reference
  --> tests/ui/mut_reference.rs:86:31
   |
LL |     my_struct.takes_raw_const(&mut 42);
   |                               ^^^^^^^ help: remove this `mut`: `&42`

error: aborting due to 12 previous errors