In my settings.json I have:
```json
    "rust-client.rlsPath": "",
    "rust.target": "thumbv7m-none-eabi",
    "rust.unstable_features": false,
    "rust-analyzer.checkOnSave.allTargets": false,
    "rust-analyzer.checkOnSave.extraArgs": [
        "--target",
        "thumbv7m-none-eabi",
        "--bin=ahek95"
    ],
    "rust.all_features": true,
    "rust.all_targets": false,
    "rust-analyzer.cargo.allFeatures": false,
```