error: usage of an `Arc` that is not `Send` and `Sync`
  --> tests/ui/arc_with_non_send_sync.rs:35:13
   |
LL |     let _ = Arc::new(RefCell::new(42));
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `Arc<RefCell<i32>>` is not `Send` and `Sync` as `RefCell<i32>` is not `Sync`
   = help: if the `Arc` will not used be across threads replace it with an `Rc`
   = help: otherwise make `RefCell<i32>` `Send` and `Sync` or consider a wrapper type such as `Mutex`
   = note: `-D clippy::arc-with-non-send-sync` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::arc_with_non_send_sync)]`

error: usage of an `Arc` that is not `Send` and `Sync`
  --> tests/ui/arc_with_non_send_sync.rs:38:13
   |
LL |     let _ = Arc::new(mutex.lock().unwrap());
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `Arc<MutexGuard<'_, i32>>` is not `Send` and `Sync` as `MutexGuard<'_, i32>` is not `Send`
   = help: if the `Arc` will not used be across threads replace it with an `Rc`
   = help: otherwise make `MutexGuard<'_, i32>` `Send` and `Sync` or consider a wrapper type such as `Mutex`

error: usage of an `Arc` that is not `Send` and `Sync`
  --> tests/ui/arc_with_non_send_sync.rs:40:13
   |
LL |     let _ = Arc::new(&42 as *const i32);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `Arc<*const i32>` is not `Send` and `Sync` as `*const i32` is neither `Send` nor `Sync`
   = help: if the `Arc` will not used be across threads replace it with an `Rc`
   = help: otherwise make `*const i32` `Send` and `Sync` or consider a wrapper type such as `Mutex`

error: aborting due to 3 previous errors