error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
  --> $DIR/ptr_arg.rs:18:14
   |
18 | fn do_vec(x: &Vec<i64>) {
   |              ^^^^^^^^^ help: change this to: `&[i64]`
   |
   = note: `-D clippy::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:26:14
   |
26 | 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:39:18
   |
39 |     fn do_vec(x: &Vec<i64>);
   |                  ^^^^^^^^^ help: change this to: `&[i64]`

error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
  --> $DIR/ptr_arg.rs:52:14
   |
52 | fn cloned(x: &Vec<u8>) -> Vec<u8> {
   |              ^^^^^^^^
help: change this to
   |
52 | fn cloned(x: &[u8]) -> Vec<u8> {
   |              ^^^^^
help: change `x.clone()` to
   |
53 |     let e = x.to_owned();
   |             ^^^^^^^^^^^^
help: change `x.clone()` to
   |
58 |     x.to_owned()
   |

error: writing `&String` instead of `&str` involves a new object where a slice will do.
  --> $DIR/ptr_arg.rs:61:18
   |
61 | fn str_cloned(x: &String) -> String {
   |                  ^^^^^^^
help: change this to
   |
61 | fn str_cloned(x: &str) -> String {
   |                  ^^^^
help: change `x.clone()` to
   |
62 |     let a = x.to_string();
   |             ^^^^^^^^^^^^^
help: change `x.clone()` to
   |
63 |     let b = x.to_string();
   |             ^^^^^^^^^^^^^
help: change `x.clone()` to
   |
68 |     x.to_string()
   |

error: writing `&String` instead of `&str` involves a new object where a slice will do.
  --> $DIR/ptr_arg.rs:71:44
   |
71 | fn false_positive_capacity(x: &Vec<u8>, y: &String) {
   |                                            ^^^^^^^
help: change this to
   |
71 | fn false_positive_capacity(x: &Vec<u8>, y: &str) {
   |                                            ^^^^
help: change `y.clone()` to
   |
73 |     let b = y.to_string();
   |             ^^^^^^^^^^^^^
help: change `y.as_str()` to
   |
74 |     let c = y;
   |             ^

error: using a reference to `Cow` is not recommended.
  --> $DIR/ptr_arg.rs:83:25
   |
83 | fn test_cow_with_ref(c: &Cow<[i32]>) {
   |                         ^^^^^^^^^^^ help: change this to: `&[i32]`

error: aborting due to 7 previous errors