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Barely noticeable compiler suggestion #62597
Description
fn main() {
let new_service = {
hyper::service::service_fn_ok(unimplemented!())
};
hyper::Server::bind(unimplemented!())
.serve(new_service);
}
Compiler error:
error[E0277]: expected a `std::ops::Fn<()>` closure, found `hyper::service::service::ServiceFnOk<_, _>`
--> src/main.rs:6:10
|
6 | .serve(new_service);
| ^^^^^ expected an `Fn<()>` closure, found `hyper::service::service::ServiceFnOk<_, _>`
|
= help: the trait `std::ops::Fn<()>` is not implemented for `hyper::service::service::ServiceFnOk<_, _>`
= note: wrap the `hyper::service::service::ServiceFnOk<_, _>` in a closure with no arguments: `|| { /* code */ }
= note: required because of the requirements on the impl of `hyper::service::new_service::NewService` for `hyper::service::service::ServiceFnOk<_, _>`
= note: required because of the requirements on the impl of `hyper::service::make_service::MakeServiceRef<hyper::server::tcp::addr_stream::AddrStream>` for `hyper::service::service::ServiceFnOk<_, _>`
I think it's better to improve this note
= note: wrap the `hyper::service::service::ServiceFnOk<_, _>` in a closure with no arguments: `|| { /* code */ }
So it's more noticeable and readable.
Activity
estebank commentedon Jul 13, 2019
rustc_on_unimplementedshould have a flag to hide the defaultE0277notes.rylev commentedon Jun 11, 2021
Triage: the example code still produces the error but it no longer works in the playground as
hyper0.12 needs to be used.