error: this lifetime isn't used in the function definition
  --> $DIR/extra_unused_lifetimes.rs:14:14
   |
LL | fn unused_lt<'a>(x: u8) {}
   |              ^^
   |
   = note: `-D clippy::extra-unused-lifetimes` implied by `-D warnings`

error: this lifetime isn't used in the function definition
  --> $DIR/extra_unused_lifetimes.rs:16:25
   |
LL | fn unused_lt_transitive<'a, 'b: 'a>(x: &'b u8) {
   |                         ^^

error: this lifetime isn't used in the function definition
  --> $DIR/extra_unused_lifetimes.rs:41:10
   |
LL |     fn x<'a>(&self) {}
   |          ^^

error: this lifetime isn't used in the function definition
  --> $DIR/extra_unused_lifetimes.rs:67:22
   |
LL |         fn unused_lt<'a>(x: u8) {}
   |                      ^^

error: aborting due to 4 previous errors