I'm updating the API of my library for embedded, so that it accepts static data. Unfortunately, I used to allowing writing operators for creating the data (it's for a keyboard, so think something like `Ctrl + Alt + Delete`.
Do you know if I can use that in a const context? I tried enabling `const_trait_impl` and writing something like:

```rust
impl const Add<KeyCode> for ModifiersByte { // const
    type Output = ReportBuilder<1>;

    fn add(self, keycode: KeyCode) -> Self::Output {
        ReportBuilder(Report {
            modifiers: self,
            keypresses: keycode.keys(),
        })
    }
}
```

But it's not accepted:

```
note: impl defined here, but it is not `const`
   --> src/hid.rs:743:5
    |
743 |     impl const Add<KeyCode> for ModifiersByte {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```

Has anyone tried this already?