message: resolve clippy issue
diff: @@ -20,12 +20,9 @@ pub struct Temperature {
  impl Temperature {
  pub fn new() -> std::rc::Rc<Temperature> {
  - #[allow(clippy::declare_interior_mutable_const)]
  - const NOT_BUSY: Cell<bool> = Cell::new(false);
  - const NOUPCALL: Cell<Option<i32>> = Cell::new(None);
  std::rc::Rc::new(Temperature {
  - busy: NOT_BUSY,
  - upcall_on_command: NOUPCALL,
  + busy: Cell::new(false),
  + upcall_on_command: Cell::new(None),
  share_ref: Default::default(),
  })
  }
  