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:88:5
   |
LL |     let mut x = vec![1, 2, 3]; // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:94:5
   |
LL |     let mut x = vec![1, 2, 3]; // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:100:5
   |
LL |     let mut x = vec![1, 2, 3]; // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:107:5
   |
LL |     let mut x = vec![1, 2, 3]; // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:124:5
   |
LL |     let mut x = HashSet::new(); // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:138:5
   |
LL |     let x = vec![1, 2, 3]; // WARNING
   |     ^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:174:5
   |
LL |     let mut s = String::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> $DIR/collection_is_never_read.rs:187:5
   |
LL |     let mut s = String::from("Hello, World!");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 12 previous errors