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A single arm inside the `select!` macro.
| Variant | Example | Meaning |
| ---------- | ----------------- | ----------------------------------------------------- |
| `Explicit` | `"async" => expr` | Arm guarded by `feature = "async"` |
| `Not` | `! => expr` | Arm guarded by `not(feature = <other_arm's_feature>)` |
| `Implicit` | `expr` | Feature determined by `.await` detection |
|
