error: prefer `FxHashMap` over `HashMap`, it has better performance
  --> $DIR/default_hash_types.rs:16:41
   |
LL |     let _map: HashMap<String, String> = HashMap::default();
   |                                         ^^^^^^^
   |
   = note: a `use rustc_data_structures::fx::FxHashMap` may be necessary
note: the lint level is defined here
  --> $DIR/default_hash_types.rs:4:9
   |
LL | #![deny(rustc::default_hash_types)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^

error: prefer `FxHashMap` over `HashMap`, it has better performance
  --> $DIR/default_hash_types.rs:16:15
   |
LL |     let _map: HashMap<String, String> = HashMap::default();
   |               ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: a `use rustc_data_structures::fx::FxHashMap` may be necessary

error: prefer `FxHashSet` over `HashSet`, it has better performance
  --> $DIR/default_hash_types.rs:19:33
   |
LL |     let _set: HashSet<String> = HashSet::default();
   |                                 ^^^^^^^
   |
   = note: a `use rustc_data_structures::fx::FxHashSet` may be necessary

error: prefer `FxHashSet` over `HashSet`, it has better performance
  --> $DIR/default_hash_types.rs:19:15
   |
LL |     let _set: HashSet<String> = HashSet::default();
   |               ^^^^^^^^^^^^^^^
   |
   = note: a `use rustc_data_structures::fx::FxHashSet` may be necessary

error: aborting due to 4 previous errors