error: lifetime parameter `'a` never used
  --> $DIR/unused-lifetime.rs:26:40
   |
LL | pub async fn func_with_unused_lifetime<'a>(s: &'a str) {
   |                                        ^^
   |
note: the lint level is defined here
  --> $DIR/unused-lifetime.rs:7:9
   |
LL | #![deny(unused_lifetimes)]
   |         ^^^^^^^^^^^^^^^^

error: lifetime parameter `'a` never used
  --> $DIR/unused-lifetime.rs:31:44
   |
LL | pub async fn func_with_two_unused_lifetime<'a, 'b>(s: &'a str, t: &'b str) {
   |                                            ^^

error: lifetime parameter `'b` never used
  --> $DIR/unused-lifetime.rs:31:48
   |
LL | pub async fn func_with_two_unused_lifetime<'a, 'b>(s: &'a str, t: &'b str) {
   |                                                ^^

error: lifetime parameter `'c` never used
  --> $DIR/unused-lifetime.rs:37:54
   |
LL | pub async fn func_with_unused_lifetime_in_two_params<'c>(s: &'c str, t: &'c str) {
   |                                                      ^^

error: aborting due to 4 previous errors