[HOWTO] rust-analyzer not working

[Mr-1311]

I am trying to install the rust-analyzer
I'm trying to install rust-analyzer but when I'm open rust buffer this message writes on bottom.
Server rls:20735 status:starting exited with status exit. Do you want to restart it? (y or n)
if I press y the number(20735) increase 1, every time. Also, the number(20735) different every time I open rust buffer.

I have done so far

• I uncomment lsp on .doom.d/init.el
• add +lsp to rust on .doom.d/init.el
• cloned the rust-analyzer repo and installed

  git clone https://github.com/rust-analyzer/rust-analyzer && cd rust-analyzer
  cargo xtask install --server
  

• installed these components
  • rustfmt-preview
  • cargo-check
  • clippy-preview
  • rust-src
• and added these line to .doom.d/config.el

  (after! rustic
    (setq rustic-lsp-server 'rust-analyzer))
  

Additional information
ra_lsp_server on my path but when I run ra_lsp_server on my shell it's write to output nothing,
so I'm not sure that if it installed correctly or not.

System information

((emacs
  (version . "26.3")
  (features . "XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD LCMS2")
  (build . "Aug 29, 2019")
  (buildopts "--prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-modules 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now")
  (windowsys . batch)
  (daemonp . server-running))
 (doom
  (version . "2.0.9")
  (build . "HEAD -> develop 721b63547 2019-12-15 02:17:40 -0500"))
 (system
  (type . gnu/linux)
  (config . "x86_64-pc-linux-gnu")
  (shell . "/usr/bin/zsh")
  (uname . "Linux 5.4.3-arch1-1 #1 SMP PREEMPT Fri, 13 Dec 2019 09:39:02 +0000 x86_64")
  (path "~/.cargo/bin" "/usr/local/bin" "/usr/bin" "/bin" "/usr/local/sbin" "/usr/bin/site_perl" "/usr/bin/vendor_perl" "/usr/bin/core_perl" "/usr/lib/emacs/26.3/x86_64-pc-linux-gnu"))
 (config
  (envfile . envvar-file)
  (elc-files . 0)
  (modules :completion company ivy :ui doom doom-dashboard doom-quit hl-todo modeline nav-flash ophints (popup +all +defaults) vc-gutter vi-tilde-fringe window-select workspaces :editor (evil +everywhere) file-templates fold multiple-cursors rotate-text snippets :emacs dired electric ibuffer vc :tools (eval +overlay) flycheck (lookup +docsets) lsp magit :lang data emacs-lisp markdown (org +dragndrop +ipython +pandoc +present) (rust +lsp) sh :config (default +bindings +smartparens))
  (packages "n/a")
  (elpa "n/a")))

[Mr-1311]

I just installed rls using rustup component add rls command and now completion is working but I guess it's not using rust-analyzer but rls even (setq rustic-lsp-server 'rust-analyzer)) in my config.el . How can I be sure which one is in use, rls or rust analyzer.

[hlissner]

Use this instead:

(after! lsp-rust
  (setq lsp-rust-server 'rust-analyzer))

Doom now uses the lsp support built into lsp-mode, not the one built into rustic. I've just updated the README to reflect this.

[Mr-1311]

Tried this

(after! lsp-rust
  (setq lsp-rust-server 'rust-analyzer))

but still when I open rust buffer this: LSP :: rls:2915 initialized successfullywrites at bottom. and M-x lsp-rust-analyzer-status says rust-analyzer not running

when I run ra_lsp_server --version on shell, it prints this: rust-analyzer ff8f805
I guess rust analyzer installed correctly but emacs not using it.

On this page it says emacs need dash and ht package and load this file. Should I do this by myself or doom emacs did it already for me?

[hlissner]

You don't need to install it's dependencies, no. Try this instead:

(setq lsp-rust-server 'rust-analyzer)

[Mr-1311]

Yes, this:

(setq lsp-rust-server 'rust-analyzer)

or this:

(after! rustic
  (setq lsp-rust-server 'rust-analyzer))

solve the problem, now emacs use rust analyzer instead of rls. Thank you.

[brotzeit]

I kept rustic-lsp-server because it is supposed to also work with eglot. Maybe this should also be mentioned for eglot users.

[hlissner]

@brotzeit Done.

[nhaas]

FYI, I recently had trouble getting rust-analyzer to work and the OPs steps helped me out. The problem I ran into though was that lsp-rust-server was being overwritten and I couldn't debug where that was happening.
That is, with (setq lsp-rust-server 'rust-analyzer) I would see lsp-rust-server == rust-analyer on startup (emacs &). However, after opening a Rust buffer, it would be changed to lsp-rust-server == rls.
In the end, I found that (setq rustic-lsp-server 'rust-analyzer) ;; $DOOMDIR/config.el would connect to rust-analyzer for all Rustic buffers.