The server does not start

The coc-rust-analyzer server is unable to start. I was having problems (like go to definition has not been working for days now), so I tried to uninstall everything including coc and do a fresh reinstall, removing all artifacts from ~/.config/coc. However now the server does not even start.

My coc settings:

{
  "languageserver": {
    "haskell": {
      "command": "ghcide",
      "args": [
        "--lsp"
      ],
      "rootPatterns": [
        ".stack.yaml",
        ".hie-bios",
        "BUILD.bazel",
        "cabal.config",
        "package.yaml"
      ],
      "filetypes": [
        "hs",
        "lhs",
        "haskell"
      ]
    },
    "ocaml-lsp": {
      "command": "opam",
      "args": ["config", "exec", "--", "ocamllsp"],
      "filetypes": ["ocaml", "reason"]
    }
  }
}

Logs:

## versions

vim version: NVIM v0.4.3
node version: v12.18.0
coc.nvim version: 0.0.78
coc.nvim directory: /home/XXX/.vim/bundle/coc.nvim
term: xterm-256color
platform: linux

## Output channel: Rust Analyzer Language Server Trace


## Output channel: rust-analyzer
[Error  - 17:38:17] Connection to server is erroring. Shutting down server.
[Error  - 17:38:17] Connection to server is erroring. Shutting down server.
[Error  - 17:38:17] Connection to server is erroring. Shutting down server.
/home/yago/.config/coc/extensions/coc-rust-analyzer-data/rust-analyzer: 3: Syntax error: "(" unexpected
[Error  - 17:38:17] /home/yago/.config/coc/extensions/coc-rust-analyzer-data/rust-analyzer exited with code: 2

Rustc/cargo version: 1.44.1

[yannham]

Thanks a lot, this allows me to at least work normally in the meantime. For the maintainer’s information, I tried to downgrade coc-rust-analyzer to 7.6 without success.

[jubos]

I encountered this as well and fixed it in the short term by downloading a rust-analyzer release for your OS from https://github.com/rust-analyzer/rust-analyzer/releases/tag/2020-06-22 and replacing the rust-analyzer binary.