rtic/examples/nrf52840_blinky/.vscode/settings.json

{
    // override the default setting (`cargo check --all-targets`) which produces the following error
    // "can't find crate for `test`" when the default compilation target is a no_std target
    // with these changes RA will call `cargo check --bins` on save
    "rust-analyzer.checkOnSave.allTargets": false,
    "rust-analyzer.checkOnSave.extraArgs": [
        "--bins"
    ]
}