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Rollup merge of rust-lang#130820 - 91khr:fix-coroutine-unit-arg, r=compiler-errors 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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