error: explicit deref method call
  --> $DIR/dereference.rs:19:19
   |
LL |     let b: &str = a.deref();
   |                   ^^^^^^^^^ help: try this: `&*a`
   |
   = note: `-D clippy::explicit-deref-method` implied by `-D warnings`

error: explicit deref_mut method call
  --> $DIR/dereference.rs:21:23
   |
LL |     let b: &mut str = a.deref_mut();
   |                       ^^^^^^^^^^^^^ help: try this: `&mut *a`

error: explicit deref method call
  --> $DIR/dereference.rs:24:39
   |
LL |     let b: String = format!("{}, {}", a.deref(), a.deref());
   |                                       ^^^^^^^^^ help: try this: `&*a`

error: explicit deref method call
  --> $DIR/dereference.rs:24:50
   |
LL |     let b: String = format!("{}, {}", a.deref(), a.deref());
   |                                                  ^^^^^^^^^ help: try this: `&*a`

error: explicit deref method call
  --> $DIR/dereference.rs:26:20
   |
LL |     println!("{}", a.deref());
   |                    ^^^^^^^^^ help: try this: `&*a`

error: explicit deref method call
  --> $DIR/dereference.rs:29:11
   |
LL |     match a.deref() {
   |           ^^^^^^^^^ help: try this: `&*a`

error: explicit deref method call
  --> $DIR/dereference.rs:33:28
   |
LL |     let b: String = concat(a.deref());
   |                            ^^^^^^^^^ help: try this: `&*a`

error: aborting due to 7 previous errors