Hello ! I was setting up a new embedded project at home, the first with async code, and I have found something a bit worrying regarding `async fn` (not) inlining behaviour. Basically, writing this:

```rust
async fn f1(n: u8) {
    f2(n).await;
}

async fn f2(n: u8) { ... }
```

takes more code and stack than writing this:

```rust
fn f1(n: u8) -> impl Future<Output = ()> {
    f2(n)
}

async fn f2(n: u8) { ... }
```

Is it a known issue?