error: accessing first element with `x.get(0)`
  --> $DIR/get_first.rs:20:13
   |
LL |     let _ = x.get(0); // Use x.first()
   |             ^^^^^^^^ help: try: `x.first()`
   |
   = note: `-D clippy::get-first` implied by `-D warnings`

error: accessing first element with `y.get(0)`
  --> $DIR/get_first.rs:25:13
   |
LL |     let _ = y.get(0); // Use y.first()
   |             ^^^^^^^^ help: try: `y.first()`

error: accessing first element with `z.get(0)`
  --> $DIR/get_first.rs:30:13
   |
LL |     let _ = z.get(0); // Use z.first()
   |             ^^^^^^^^ help: try: `z.first()`

error: aborting due to 3 previous errors