error[E0308]: mismatched types
  --> $DIR/deref-multi.rs:2:5
   |
LL | fn a(x: &&i32) -> i32 {
   |                   --- expected `i32` because of return type
LL |     x
   |     ^ expected `i32`, found `&&i32`
   |
help: consider dereferencing the borrow
   |
LL |     **x
   |     ++

error[E0308]: mismatched types
  --> $DIR/deref-multi.rs:7:5
   |
LL | fn a2(x: &&&&&i32) -> i32 {
   |                       --- expected `i32` because of return type
LL |     x
   |     ^ expected `i32`, found `&&&&&i32`
   |
help: consider dereferencing the borrow
   |
LL |     *****x
   |     +++++

error[E0308]: mismatched types
  --> $DIR/deref-multi.rs:12:5
   |
LL | fn b(x: &i32) -> i32 {
   |                  --- expected `i32` because of return type
LL |     &x
   |     ^^ expected `i32`, found `&&i32`
   |
help: consider removing the `&` and dereferencing the borrow instead
   |
LL |     *x
   |     ~

error[E0308]: mismatched types
  --> $DIR/deref-multi.rs:17:5
   |
LL | fn c(x: Box<i32>) -> i32 {
   |                      --- expected `i32` because of return type
LL |     &x
   |     ^^ expected `i32`, found `&Box<i32>`
   |
   = note:   expected type `i32`
           found reference `&Box<i32>`
help: consider removing the `&` and dereferencing the borrow instead
   |
LL |     *x
   |     ~

error[E0308]: mismatched types
  --> $DIR/deref-multi.rs:22:5
   |
LL | fn d(x: std::sync::Mutex<&i32>) -> i32 {
   |                                    --- expected `i32` because of return type
LL |     x.lock().unwrap()
   |     ^^^^^^^^^^^^^^^^^ expected `i32`, found struct `MutexGuard`
   |
   = note: expected type `i32`
            found struct `MutexGuard<'_, &i32>`
help: consider dereferencing the type
   |
LL |     **x.lock().unwrap()
   |     ++

error: aborting due to 5 previous errors

For more information about this error, try `rustc --explain E0308`.