error: this argument is passed by reference, but would be more efficient if passed by value
  --> $DIR/test.rs:20:11
   |
20 | fn bad(x: &u16, y: &Foo) {}
   |           ^^^^ help: consider passing by value instead: `u16`
   |
   = note: `-D clippy::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:20:20
   |
20 | fn bad(x: &u16, y: &Foo) {}
   |                    ^^^^ help: consider passing by value instead: `Foo`

error: aborting due to 2 previous errors