error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:31:18
   |
31 |         foo_rstr(rstr.as_ref());
   |                  ^^^^^^^^^^^^^ help: try this: `rstr`
   |
note: lint level defined here
  --> $DIR/useless_asref.rs:1:9
   |
1  | #![deny(useless_asref)]
   |         ^^^^^^^^^^^^^

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:33:20
   |
33 |         foo_rslice(rslice.as_ref());
   |                    ^^^^^^^^^^^^^^^ help: try this: `rslice`

error: this call to `as_mut` does nothing
  --> $DIR/useless_asref.rs:37:21
   |
37 |         foo_mrslice(mrslice.as_mut());
   |                     ^^^^^^^^^^^^^^^^ help: try this: `mrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:39:20
   |
39 |         foo_rslice(mrslice.as_ref());
   |                    ^^^^^^^^^^^^^^^^ help: try this: `mrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:46:20
   |
46 |         foo_rslice(rrrrrslice.as_ref());
   |                    ^^^^^^^^^^^^^^^^^^^ help: try this: `rrrrrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:48:18
   |
48 |         foo_rstr(rrrrrstr.as_ref());
   |                  ^^^^^^^^^^^^^^^^^ help: try this: `rrrrrstr`

error: this call to `as_mut` does nothing
  --> $DIR/useless_asref.rs:53:21
   |
53 |         foo_mrslice(mrrrrrslice.as_mut());
   |                     ^^^^^^^^^^^^^^^^^^^^ help: try this: `mrrrrrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:55:20
   |
55 |         foo_rslice(mrrrrrslice.as_ref());
   |                    ^^^^^^^^^^^^^^^^^^^^ help: try this: `mrrrrrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:58:16
   |
58 |     foo_rrrrmr((&&&&MoreRef).as_ref());
   |                ^^^^^^^^^^^^^^^^^^^^^^ help: try this: `(&&&&MoreRef)`

error: this call to `as_mut` does nothing
   --> $DIR/useless_asref.rs:104:13
    |
104 |     foo_mrt(mrt.as_mut());
    |             ^^^^^^^^^^^^ help: try this: `mrt`

error: this call to `as_ref` does nothing
   --> $DIR/useless_asref.rs:106:12
    |
106 |     foo_rt(mrt.as_ref());
    |            ^^^^^^^^^^^^ help: try this: `mrt`