RLS and Rust

[brettg]

Hey all.

I am trying to use the rust language server. This might be a better 
question for a rust oriented mailing list, but I am going to give it a 
go here first.

I imported and installed the RLS from the crate importer, and installed 
it that way. When I try to start the RLS from emacs using the lsp-mode I 
get the following error.

"Server rls:5302 status:starting exited with status exit. Do you want to 
restart it? (y or n) n"

Now, the RLS page suggests to add components from rustup such as 
"rust-src" and "rust-analysis". I have the rust src checkout from git 
and the environment variable RUST_SRC_PATH set to point to that 
directory. However, that is not enough.

Does anybody have any ideas on how to proceed? Also, what is the status 
on getting rust packages upstream to guix master? I know we have some 
additional bootstrapping efforts to get through first.

Is anybody out there doing rust development from GuixSD?

(define-public rust-rls
  (package
   (name "rust-rls")
   (version "0.122.2")
   (source
    (origin
     (method url-fetch)
     (uri (crate-uri "rls" version))
     (file-name
      (string-append name "-" version ".tar.gz"))
     (sha256
      (base32
       "18an9hp8v68rwc5i2939h1fpjdfi4y2317c46yafv7j2rb6dfixg"))))
   (build-system cargo-build-system)
   (home-page
    "https://github.com/rust-lang-nursery/rls";)
   (synopsis
    "Rust Language Server - provides information about Rust programs to 
IDEs and other tools")
   (description
    "Rust Language Server - provides information about Rust programs to 
IDEs and other tools")
   (license #f)))