Only lint use_last

Still getting unknown lint error on use_last...

Author: HarrisonMc555

tests/ui/use_last.rs

@@ -1,5 +1,4 @@
-#![warn(clippy::all)]
-// #![warn(clippy::use_last)]
+#![warn(clippy::use_last)]
 
 fn dont_use_last() -> Option<i32> {
     let x = vec![2, 3, 5];