error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:3:21
   |
LL | fn simple(a: usize, b: usize) -> usize {
   |                     ^ help: if this is intentional, prefix with an underscore: `_b`
   |
   = note: `-D clippy::only-used-in-recursion` implied by `-D warnings`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:7:24
   |
LL | fn with_calc(a: usize, b: isize) -> usize {
   |                        ^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:11:14
   |
LL | fn tuple((a, b): (usize, usize)) -> usize {
   |              ^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:15:24
   |
LL | fn let_tuple(a: usize, b: usize) -> usize {
   |                        ^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:20:14
   |
LL | fn array([a, b]: [usize; 2]) -> usize {
   |              ^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:24:20
   |
LL | fn index(a: usize, mut b: &[usize], c: usize) -> usize {
   |                    ^^^^^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:24:37
   |
LL | fn index(a: usize, mut b: &[usize], c: usize) -> usize {
   |                                     ^ help: if this is intentional, prefix with an underscore: `_c`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:28:21
   |
LL | fn break_(a: usize, mut b: usize, mut c: usize) -> usize {
   |                     ^^^^^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:46:23
   |
LL | fn mut_ref2(a: usize, b: &mut usize) -> usize {
   |                       ^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:51:28
   |
LL | fn not_primitive(a: usize, b: String) -> usize {
   |                            ^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:68:33
   |
LL |     fn method2(&self, a: usize, b: usize) -> usize {
   |                                 ^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:90:24
   |
LL |     fn hello(a: usize, b: usize) -> usize {
   |                        ^ help: if this is intentional, prefix with an underscore: `_b`

error: parameter is only used in recursion
  --> $DIR/only_used_in_recursion.rs:94:32
   |
LL |     fn hello2(&self, a: usize, b: usize) -> usize {
   |                                ^ help: if this is intentional, prefix with an underscore: `_b`

error: aborting due to 13 previous errors