error: collection is never read
  --> tests/ui/collection_is_never_read.rs:21:5
   |
LL |     let mut x = HashMap::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::collection-is-never-read` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::collection_is_never_read)]`

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:62:5
   |
LL |     let mut x = vec![1, 2, 3];
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:78:5
   |
LL |     let mut x = HashMap::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:84:5
   |
LL |     let mut x = HashMap::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:93:5
   |
LL |     let mut x = vec![1, 2, 3];
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

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

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

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:115:5
   |
LL |     let mut x = vec![1, 2, 3];
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:133:5
   |
LL |     let mut x = HashSet::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:148:5
   |
LL |     let x = vec![1, 2, 3];
   |     ^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:184:5
   |
LL |     let mut x = std::collections::BTreeMap::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:188:5
   |
LL |     let mut x = std::collections::BTreeSet::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:192:5
   |
LL |     let mut x = std::collections::BinaryHeap::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:196:5
   |
LL |     let mut x = std::collections::HashMap::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:200:5
   |
LL |     let mut x = std::collections::HashSet::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:204:5
   |
LL |     let mut x = std::collections::LinkedList::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:208:5
   |
LL |     let mut x = Some(true);
   |     ^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:212:5
   |
LL |     let mut x = String::from("hello");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:216:5
   |
LL |     let mut x = Vec::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^

error: collection is never read
  --> tests/ui/collection_is_never_read.rs:221:5
   |
LL |     let mut x = std::collections::VecDeque::new();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 20 previous errors