feature request: config switch between legacy and RLS mode

[seanjensengrey]

Version of VSCode: 1.11.2 (1.11.2)
Version of the extension: 0.3.11
OS: OSX 10.10.5

There should be a configuration option to switch between legacy (racer, rustfmt, rustsym) and RLS mode.

If one of the legacy mode utilities is found, legacy mode is activated even if RLS is configured in settings.json via

{
    "rust.rls": {
        "executable": "rustup",
        "args": ["run", "nightly", "rls"]
    }
}

At the very least, if RLS is defined in user settings it should override the automatic detection of legacy mode.

[KalitaAlexey]

@seanjensengrey,
Actually if RLS is found, it will use RLS.

[buster]

How do i know if RLS mode is used? It says "Racer: on" in the bottom, but rls is definitely installed.

[KalitaAlexey]

@buster,
What version do you use: from the marketplace or from the source?
If you use the version from the marketplace, you should set rust.rls.executable in order to make it work.
If you use the version from the source, you shouldn't set anything, it must work.

[TedDriggs]

Is there a way to disable RLS mode on 0.3.13? I'm working on projects that use workspaces, and those aren't working well with RLS right now (see rust-lang/rls#263)

[KalitaAlexey]

Remove RLS component from rustup. There is no other way.

[KalitaAlexey]

@TedDriggs,
I will add "rust.forceLegacyMode: boolean" to allow this.