find-definition requires `extern crate` in 2018 edition

[tarka]

extern crate is no longer required in the 2018 edition preview. However, trying find-definition 3 25 on the following code fails. However if add extern crate actix_web; it works.

#![feature(rust_2018_preview)]

use actix_web::{server, App, HttpRequest};

fn index(_req: &HttpRequest) -> &'static str {
    "Hello world!"
}

fn main() {
   server::new(|| App::new().resource("/", |r| r.f(index)))
        .bind("127.0.0.1:8088")
        .unwrap()
        .run();
}

(This is built from master 22033f9, using emacs-racer, but confirmed on the commandline.)

[kngwyu]

Thanks!
It's just not implemented yet 😓

[kngwyu]

By #930 racer know current project's edition.
Next step is to know 'where the current crate is'.

[tav]

Is anyone planning on working on this by any chance?

[kngwyu]

I'm worrying about the overhead of calling cargo metadata just to know what the edition is.
But, anyway, I'm going to include this in 2.2 release and any contribution is welcome.