Bad format for closure that have only one expression

[zonyitoo]

pub fn run(config: Config) -> io::Result<()> {
    let mut lp = try!(Core::new());
    let handle = lp.handle();

    let enable_udp = config.enable_udp;

    let context = Context::new(handle, config);
    Context::set(&context, move || if enable_udp {
        let tcp_fut = run_tcp();
        let udp_fut = run_udp();
        lp.run(tcp_fut.join(udp_fut).map(|_| ()))
    } else {
        let tcp_fut = run_tcp();
        lp.run(tcp_fut)
    })
}

As you can see, the closure passed to set function only has one if expression. And rustfmt won't allow me to add a block around it.

It would be better if it is formatted as

pub fn run(config: Config) -> io::Result<()> {
    let mut lp = try!(Core::new());
    let handle = lp.handle();

    let enable_udp = config.enable_udp;

    let context = Context::new(handle, config);
    Context::set(&context, move ||
        if enable_udp {
            let tcp_fut = run_tcp();
            let udp_fut = run_udp();
            lp.run(tcp_fut.join(udp_fut).map(|_| ()))
        } else {
            let tcp_fut = run_tcp();
            lp.run(tcp_fut)
        })
}

problem will also occurs for match and other expressions that has a block in it.

Maybe related to #1570 or #1504.

[nrc]

This is intentional. It might be worth bringing this up on rust-lang/style-team#61