Prerequisite

• Ubuntu 20.04
• node.js.

Install neovim

apt-get install neovim

Install vimplug

sh -c 'curl -fLo "${XDG_DATA_HOME:-$HOME/.local/share}"/nvim/site/autoload/plug.vim --create-dirs \
       https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim'

(source: https://github.com/junegunn/vim-plug)

Setup vimplug

nvim $HOME/.config/nvim/init.vim

In $HOME/.config/nvim/init.vim

call plug#begin(stdpath("data") . '/plugged')

call plug#end()

Install coc.vim

In $HOME/.config/nvim/init.vim

call plug#begin(stdpath("data") . '/plugged')
Plug 'neoclide/coc.nvim', {'branch': 'release'}
call plug#end()

In nvim,

:PlugInstall

Install rust-analyzer

mkdir .local/bin
curl -L https://github.com/rust-analyzer/rust-analyzer/releases/latest/download/rust-analyzer-linux -o ~/.local/bin/rust-analyzer
chmod +x ~/.local/bin/rust-analyzer

(source: https://rust-analyzer.github.io/manual.html#rust-analyzer-language-server-binary)

Install coc-rust-analyzer

In nvim,

:CocInstall coc-rust-analyzer

Setup coc

In $HOME/.config/nvim/coc-settings.json

{"rust-analyzer.server.path": "/home/YOURNAME/.local/bin/rust-analyzer"}                                                                                                         

Please replace YOURNAME with your name.

Open a source code in Rust

It should work.