error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
 --> $DIR/ptr_arg.rs:6:14
  |
6 | fn do_vec(x: &Vec<i64>) {
  |              ^^^^^^^^^ help: change this to: `&[i64]`
  |
  = note: `-D ptr-arg` implied by `-D warnings`

error: writing `&String` instead of `&str` involves a new object where a slice will do.
  --> $DIR/ptr_arg.rs:14:14
   |
14 | fn do_str(x: &String) {
   |              ^^^^^^^ help: change this to: `&str`

error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
  --> $DIR/ptr_arg.rs:27:18
   |
27 |     fn do_vec(x: &Vec<i64>);
   |                  ^^^^^^^^^ help: change this to: `&[i64]`

error: aborting due to 3 previous errors