error: this argument is passed by reference, but would be more efficient if passed by value
  --> $DIR/test.rs:12:11
   |
12 | fn bad(x: &u16, y: &Foo) {
   |           ^^^^ help: consider passing by value instead: `u16`
   |
   = note: `-D trivially-copy-pass-by-ref` implied by `-D warnings`

error: this argument is passed by reference, but would be more efficient if passed by value
  --> $DIR/test.rs:12:20
   |
12 | fn bad(x: &u16, y: &Foo) {
   |                    ^^^^ help: consider passing by value instead: `Foo`

error: aborting due to 2 previous errors