error: usage of `Rc<Mutex<_>>`
  --> $DIR/rc_mutex.rs:8:10
   |
LL |     foo: Rc<Mutex<i32>>,
   |          ^^^^^^^^^^^^^^
   |
   = note: `-D clippy::rc-mutex` implied by `-D warnings`
   = help: consider using `Rc<RefCell<_>>` or `Arc<Mutex<_>>` instead

error: usage of `Rc<Mutex<_>>`
  --> $DIR/rc_mutex.rs:26:18
   |
LL | fn test1<T>(foo: Rc<Mutex<T>>) {}
   |                  ^^^^^^^^^^^^
   |
   = help: consider using `Rc<RefCell<_>>` or `Arc<Mutex<_>>` instead

error: usage of `Rc<Mutex<_>>`
  --> $DIR/rc_mutex.rs:27:15
   |
LL | fn test2(foo: Rc<Mutex<MyEnum>>) {}
   |               ^^^^^^^^^^^^^^^^^
   |
   = help: consider using `Rc<RefCell<_>>` or `Arc<Mutex<_>>` instead

error: usage of `Rc<Mutex<_>>`
  --> $DIR/rc_mutex.rs:28:15
   |
LL | fn test3(foo: Rc<Mutex<SubT<usize>>>) {}
   |               ^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider using `Rc<RefCell<_>>` or `Arc<Mutex<_>>` instead

error: aborting due to 4 previous errors