Update vim to RLS

init.vim

@@ -26,7 +26,12 @@ Plug 'vim-airline/vim-airline-themes'
 Plug 'scrooloose/nerdtree'
 Plug 'w0rp/ale'
 Plug 'digitaltoad/vim-pug'
-Plug 'racer-rust/vim-racer'
+Plug 'prabirshrestha/async.vim'
+Plug 'prabirshrestha/vim-lsp'
+Plug 'prabirshrestha/asyncomplete.vim'
+Plug 'prabirshrestha/asyncomplete-lsp.vim'
+
+
 call plug#end()
 
 " Line numbers and syntaxic coloration
@@ -143,5 +148,13 @@ autocmd CursorMovedI * if pumvisible() == 0|pclose|endif
 autocmd InsertLeave * if pumvisible() == 0|pclose|endif
 " Complete on tab
 inoremap <expr><TAB>  pumvisible() ? "\<C-n>" : "\<TAB>"
+
+if executable('rls')
+    au User lsp_setup call lsp#register_server({
+        \ 'name': 'rls',
+        \ 'cmd': {server_info->['rustup', 'run', 'stable', 'rls']},
+        \ 'whitelist': ['rust'],
+        \ })
+endif
 " }}}