error: this lifetime isn't used in the function definition --> unused_lt.rs:16:14 | 16 | fn unused_lt<'a>(x: u8) { | ^^ | = note: `-D unused-lifetimes` implied by `-D warnings` error: this lifetime isn't used in the function definition --> unused_lt.rs:20:25 | 20 | fn unused_lt_transitive<'a, 'b: 'a>(x: &'b u8) { | ^^ error: this lifetime isn't used in the function definition --> unused_lt.rs:50:10 | 50 | fn x<'a>(&self) {} | ^^ error: aborting due to 3 previous errors To learn more, run the command again with --verbose.