message: Clippy: Resolve derivable-impls
diff: @@ -221,6 +221,7 @@ impl TaskHandlePriorityQueue {
  }
  }
  +#[derive(Default)]
  struct QueueHead {
  head: Option<Rc<RefCell<Task>>>,
  tail: Option<Rc<RefCell<Task>>>,
  @@ -235,15 +236,6 @@ impl QueueHead {
  }
  }
  -impl Default for QueueHead {
  - fn default() -> Self {
  - Self {
  - head: None,
  - tail: None,
  - }
  - }
  -}
  -
  /// Realize a priority queue for tasks
  pub struct PriorityTaskQueue {
  queues: [QueueHead; NO_PRIORITIES],
  