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:
   = note: - the trait `Sync` is not implemented for `RefCell<i32>`
   = help: consider using an `Rc` instead. `Arc` does not provide benefits for non `Send` and `Sync` types
   = note: if you intend to use `Arc` with `Send` and `Sync` traits
   = note: wrap the inner type with a `Mutex` or implement `Send` and `Sync` for `RefCell<i32>`
   = 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:40:13
   |
LL |     let _ = Arc::new(mutex.lock().unwrap());
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `Arc<MutexGuard<'_, i32>>` is not `Send` and `Sync` as:
   = note: - the trait `Send` is not implemented for `MutexGuard<'_, i32>`
   = help: consider using an `Rc` instead. `Arc` does not provide benefits for non `Send` and `Sync` types
   = note: if you intend to use `Arc` with `Send` and `Sync` traits
   = note: wrap the inner type with a `Mutex` or implement `Send` and `Sync` for `MutexGuard<'_, i32>`

error: usage of an `Arc` that is not `Send` and `Sync`
  --> tests/ui/arc_with_non_send_sync.rs:44:13
   |
LL |     let _ = Arc::new(&42 as *const i32);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `Arc<*const i32>` is not `Send` and `Sync` as:
   = note: - the trait `Send` is not implemented for `*const i32`
   = note: - the trait `Sync` is not implemented for `*const i32`
   = help: consider using an `Rc` instead. `Arc` does not provide benefits for non `Send` and `Sync` types
   = note: if you intend to use `Arc` with `Send` and `Sync` traits
   = note: wrap the inner type with a `Mutex` or implement `Send` and `Sync` for `*const i32`

error: aborting due to 3 previous errors