error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:29:18
   |
29 |         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:31:20
   |
31 |         foo_rslice(rslice.as_ref());
   |                    ^^^^^^^^^^^^^^^ help: try this: `rslice`

error: this call to `as_mut` does nothing
  --> $DIR/useless_asref.rs:35:21
   |
35 |         foo_mrslice(mrslice.as_mut());
   |                     ^^^^^^^^^^^^^^^^ help: try this: `mrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:37:20
   |
37 |         foo_rslice(mrslice.as_ref());
   |                    ^^^^^^^^^^^^^^^^ help: try this: `mrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:44:20
   |
44 |         foo_rslice(rrrrrslice.as_ref());
   |                    ^^^^^^^^^^^^^^^^^^^ help: try this: `rrrrrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:46:18
   |
46 |         foo_rstr(rrrrrstr.as_ref());
   |                  ^^^^^^^^^^^^^^^^^ help: try this: `rrrrrstr`

error: this call to `as_mut` does nothing
  --> $DIR/useless_asref.rs:51:21
   |
51 |         foo_mrslice(mrrrrrslice.as_mut());
   |                     ^^^^^^^^^^^^^^^^^^^^ help: try this: `mrrrrrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:53:20
   |
53 |         foo_rslice(mrrrrrslice.as_ref());
   |                    ^^^^^^^^^^^^^^^^^^^^ help: try this: `mrrrrrslice`

error: this call to `as_ref` does nothing
  --> $DIR/useless_asref.rs:56:16
   |
56 |     foo_rrrrmr((&&&&MoreRef).as_ref());
   |                ^^^^^^^^^^^^^^^^^^^^^^ help: try this: `(&&&&MoreRef)`