error: functions used as benches must have signature `fn(&mut Bencher) -> impl Termination`
  --> $DIR/issue-12997-1.rs:8:1
   |
LL | fn foo() { }
   | ^^^^^^^^^^^^

error: functions used as benches must have signature `fn(&mut Bencher) -> impl Termination`
  --> $DIR/issue-12997-1.rs:11:1
   |
LL | fn bar(x: isize, y: isize) { }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors