error: this lifetime isn't used in the function definition
  --> tests/ui/extra_unused_lifetimes.rs:19:14
   |
LL | fn unused_lt<'a>(x: u8) {}
   |              ^^
   |
   = note: `-D clippy::extra-unused-lifetimes` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::extra_unused_lifetimes)]`

error: this lifetime isn't used in the function definition
  --> tests/ui/extra_unused_lifetimes.rs:46:10
   |
LL |     fn x<'a>(&self) {}
   |          ^^

error: this lifetime isn't used in the function definition
  --> tests/ui/extra_unused_lifetimes.rs:72:22
   |
LL |         fn unused_lt<'a>(x: u8) {}
   |                      ^^

error: this lifetime isn't used in the impl
  --> tests/ui/extra_unused_lifetimes.rs:83:10
   |
LL |     impl<'a> std::ops::AddAssign<&Scalar> for &mut Scalar {
   |          ^^

error: this lifetime isn't used in the impl
  --> tests/ui/extra_unused_lifetimes.rs:89:10
   |
LL |     impl<'b> Scalar {
   |          ^^

error: this lifetime isn't used in the function definition
  --> tests/ui/extra_unused_lifetimes.rs:90:26
   |
LL |         pub fn something<'c>() -> Self {
   |                          ^^

error: this lifetime isn't used in the impl
  --> tests/ui/extra_unused_lifetimes.rs:119:10
   |
LL |     impl<'a, T: Source + ?Sized + 'a> Source for Box<T> {
   |          ^^

error: aborting due to 7 previous errors