error: collection is never read
  --> $DIR/collection_is_never_read.rs:21:5
   |
LL |     let mut x = HashMap::new(); // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::collection-is-never-read` implied by `-D warnings`

error: collection is never read
  --> $DIR/collection_is_never_read.rs:60:5
   |
LL |     let mut x = vec![1, 2, 3]; // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:75:5
   |
LL |     let mut x = HashMap::new(); // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:80:5
   |
LL |     let mut x = HashMap::new(); // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:95:5
   |
LL |     let mut x = vec![1, 2, 3]; // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:102:5
   |
LL |     let mut x = vec![1, 2, 3]; // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:119:5
   |
LL |     let mut x = HashSet::new(); // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:133:5
   |
LL |     let x = vec![1, 2, 3]; // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 8 previous errors