error: binding has unit type `()`
  --> $DIR/unit_bindings.rs:50:5
   |
LL |     let _ = expr;
   |     ^^^^-^^^^^^^^
   |         |
   |         this pattern is inferred to be the unit type `()`
   |
note: the lint level is defined here
  --> $DIR/unit_bindings.rs:22:30
   |
LL | #![cfg_attr(deny_level, deny(unit_bindings))]
   |                              ^^^^^^^^^^^^^

error: binding has unit type `()`
  --> $DIR/unit_bindings.rs:51:5
   |
LL |     let pat = expr;
   |     ^^^^---^^^^^^^^
   |         |
   |         this pattern is inferred to be the unit type `()`

error: binding has unit type `()`
  --> $DIR/unit_bindings.rs:52:5
   |
LL |     let _pat = expr;
   |     ^^^^----^^^^^^^^
   |         |
   |         this pattern is inferred to be the unit type `()`

error: binding has unit type `()`
  --> $DIR/unit_bindings.rs:55:5
   |
LL |     let list = v.sort();
   |     ^^^^----^^^^^^^^^^^^
   |         |
   |         this pattern is inferred to be the unit type `()`

error: aborting due to 4 previous errors