implicit_return suggestion is invalid syntax

[rye]

I tried this code (from this file, Archive):

pub async fn execute(&mut self) -> Result<()> {
    use std::net::{IpAddr, SocketAddr};

    let socket = {
        use core::convert::TryInto;

        let config: &config::Config = &self.0;

        let host: IpAddr = config
            .get_str("server.host")?
            .parse()
            .map_err(|_| distringo::Error::InvalidServerHost)?;
        let port: u16 = config
            .get_int("server.port")?
            .try_into()
            .map_err(|_| distringo::Error::InvalidServerPort)?;

        SocketAddr::new(host, port)
    };

    warp::serve(routes::routes(&self.0)?).run(socket).await;

    Ok(())
}

I would expect the implicit_return lint to suggest the last line be changed to:

    return Ok(());

Instead, the implicit_return lint produced the suggestion:

warning: missing `return` statement
  --> server/src/server.rs:40:48
   |
40 |       pub async fn execute(&mut self) -> Result<()> {
   |  ___________________________________________________^
41 | |         use std::net::{IpAddr, SocketAddr};
42 | |
43 | |         let socket = {
...  |
62 | |         Ok(())
63 | |     }
   | |_____^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#implicit_return
help: add `return` as shown
   |
40 |     pub async fn execute(&mut self) -> Result<()> return {
41 |         use std::net::{IpAddr, SocketAddr};
42 |
43 |         let socket = {
44 |             use core::convert::TryInto;
45 |
 ...

A return before the body isn't accepted by the compiler and seems broken to me.

Meta

For reference, clippy was invoked with:

cargo clippy --all -- -W clippy::restriction -W clippy::pedantic -D clippy::all -D clippy::correctness

• cargo clippy -V: clippy 0.1.51 (73f48e5 2021-03-18)
  • This also happens with cargo +stable clippy -V: clippy 0.0.212 (cb75ad5 2021-02-10)
• rustc -Vv:

  rustc 1.51.0-beta.8 (73f48e5f6 2021-03-18)
  binary: rustc
  commit-hash: 73f48e5f6f6217c4bf93026bc0072637966d6eab
  commit-date: 2021-03-18
  host: x86_64-unknown-linux-gnu
  release: 1.51.0-beta.8
  LLVM version: 11.0.1
  

[rustbot]

Error: Label l-suggestion-causes-error can only be set by Rust team members

Please let @rust-lang/release know if you're having trouble with this bot.