Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, hecrj/setup-rust-action@v1, actions/setup-python@v4, actions/cache@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

3rd rule of macro `FN` is never used

variable does not need to be mutable