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0acddf5060
Fix diagnostics for coroutines with () as input.
This may be a more real-life example to trigger the diagnostic:
```rust
#![features(try_blocks, coroutine_trait, coroutines)]
use std::ops::Coroutine;
struct Request;
struct Response;
fn get_args() -> Result<String, String> { todo!() }
fn build_request(_arg: String) -> Request { todo!() }
fn work() -> impl Coroutine<Option<Response>, Yield = Request> {
#[coroutine]
|_| {
let r: Result<(), String> = try {
let req = get_args()?;
yield build_request(req)
};
if let Err(msg) = r {
eprintln!("Error: {msg}");
}
}
}
```
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