src/test/ui/lint/lint-match-arms.rs

   1 fn deny_on_arm() {
   2     match 0 {
   3         #[deny(unused_variables)]
   4         //~^ NOTE the lint level is defined here
   5         y => (),
   6         //~^ ERROR unused variable
   7     }
   8 }
   9
  10 #[deny(unused_variables)]
  11 fn allow_on_arm() {
  12     match 0 {
  13         #[allow(unused_variables)]
  14         y => (), // OK
  15     }
  16 }
  17
  18 fn main() {}