Refresh Rust setup in vim

.vimrc.keymap

@@ -32,3 +32,20 @@ nnoremap <leader>' :execute "Find " . expand("<cword>")<cr>
 
 " tree
 map <leader>n :NERDTreeToggle<CR>
+
+" completion
+inoremap <expr> <Tab> pumvisible() ? "\<C-n>" : "\<Tab>"
+inoremap <expr> <S-Tab> pumvisible() ? "\<C-p>" : "\<S-Tab>"
+inoremap <expr> <cr> pumvisible() ? "\<C-y>" : "\<cr>"
+imap <c-space> <Plug>(asyncomplete_force_refresh)
+
+function! s:check_back_space() abort
+    let col = col('.') - 1
+    return !col || getline('.')[col - 1]  =~ '\s'
+endfunction
+
+inoremap <silent><expr> <TAB>
+  \ pumvisible() ? "\<C-n>" :
+  \ <SID>check_back_space() ? "\<TAB>" :
+  \ asyncomplete#force_refresh()
+inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"

.vimrc.plugins

@@ -8,6 +8,7 @@ endif
 call plug#begin('~/.vim/plugged')
 
 Plug 'airblade/vim-gitgutter'
+Plug 'cespare/vim-toml'
 Plug 'godlygeek/tabular'
 Plug 'https://github.com/cyplo/vim-colors-solarized.git'
 Plug 'junegunn/fzf.vim'

.vimrc.plugins-settings

@@ -13,15 +13,18 @@ let g:fzf_command_prefix = 'Fzf'
 command! -bang -nargs=* Find call fzf#vim#grep('rg --column --line-number --no-heading --fixed-strings --ignore-case --no-ignore --hidden --follow --glob "!.git/*" --color "always" '.shellescape(<q-args>), 1, <bang>0)
 let g:ctrlp_show_hidden = 1
 
-" register rust rls
-if executable('rls')
-    au User lsp_setup call lsp#register_server({
-        \ 'name': 'rls',
-        \ 'cmd': {server_info->['rustup', 'run', 'stable', 'rls']},
-        \ 'whitelist': ['rust'],
-        \ })
-endif
+" code smarts - completion, navigation
+let g:asyncomplete_remove_duplicates = 1
+let g:asyncomplete_smart_completion = 1
+let g:asyncomplete_auto_popup = 1
+
+au User lsp_setup call lsp#register_server({
+    \ 'name': 'rls',
+    \ 'cmd': {server_info->['rustup', 'run', 'stable', 'rls']},
+    \ 'whitelist': ['rust'],
+    \ })
 
 " nerdtree startup
 autocmd StdinReadPre * let s:std_in=1
 autocmd VimEnter * if argc() == 1 && isdirectory(argv()[0]) && !exists("s:std_in") | exe 'NERDTree' argv()[0] | wincmd p | ene | endif
+