Rust文件中Vim自动补全插入错误左大括号问题排查求助

各位Vim同好们，最近写Rust代码的时候碰到个闹心的小问题：自动补全时总是会插入格式错误的左大括号——要么位置跑偏，要么平白无故多出来一个，严重拖慢写代码的节奏。我把自己的.vimrc完整配置贴在下面，麻烦大伙帮我瞅一眼，到底哪块配置可能出问题了？

set runtimepath^=~/.config/vim
" Visual mode select and move laterally using < and > sign
vnoremap < <gv
vnoremap > >gv
" Centre align search and n & N
nnoremap <silent> n nzzzv
nnoremap <silent> N Nzzzv
set hlsearch " Highlight all matches of the search
set incsearch " Show matches as you type
nnoremap <silent> <Esc> :nohlsearch<CR>
" Disable visual bell and turn off error beeping
set visualbell t_vb=
" Python path
let g:python3_host_prog = '~/.config/miniconda3/bin/python'
" Don't show extra line
set noshowmode
" Enable true color support
set termguicolors
" Set 24-bit RGB colors for terminal foreground and background
let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
" Set leader key to space
let mapleader = " "
" Use 'Tab' to select the current item in the completion menu (Ctrl-y)
inoremap <expr> <Tab> pumvisible() ? "\<C-y>" : "\<Tab>"
" File and buffer shortcuts
nnoremap <Leader>ff :call fzf#run(fzf#wrap({'source': 'rg --files --hidden --glob "!.git/*" --glob "!node_modules/*" --glob "!__pycache__/*" --glob "!target/*" --glob "!tmp/*"', 'options': '--preview "bat --color always {}"'}))<CR>
nnoremap <Leader>fg :RG <CR>
nnoremap <Leader>rg :Rg <CR>
nnoremap <Leader>bf :Buffers<CR>
noremap <leader>bd :bd<CR>
noremap <leader>bu :bd!<CR>
noremap <leader>bc :close<CR>
nnoremap <leader>q :BufOnly<CR>
nnoremap <Leader>h :History<CR>
nnoremap <Leader>c :Commands<CR>
" NERDTree configuration
let NERDTreeIgnore = ['\.pyc$', '\~$', '^node_modules$', '^__pycache__$', '^target$', '^\.git$', '^tmp$']
augroup NERDTreeAutoResize
autocmd!
autocmd FileType nerdtree call ResizeNERDTreeToHalf()
augroup END
function! ResizeNERDTreeToHalf()
let l:half_width = float2nr(&columns * 4 / 5)
execute "vertical resize " . l:half_width
endfunction
let g:NERDTreeWinPos = "right"
nnoremap <leader>e :call ToggleNERDTreePosition()<CR>
function! ToggleNERDTreePosition()
if exists("t:NERDTreeBufName")
NERDTreeClose
endif
if g:NERDTreeWinPos ==# 'left'
let g:NERDTreeWinPos = 'right'
else
let g:NERDTreeWinPos = 'left'
endif
NERDTreeToggle
echo "NERDTree position set to " . g:NERDTreeWinPos
endfunction
nnoremap - :NERDTreeToggle<CR>
nnoremap <leader>x :q<CR>
nnoremap <leader>n :enew<CR>
nnoremap <leader>u :UndotreeToggle<CR>
" Map leader + tc to open the Colors menu
nnoremap <leader>th :call OpenColorsMenu()<CR>
" Map leader + ts to save the selected colorscheme
nnoremap <leader>ts :call SaveColorscheme()<CR>
" Map Ctrl + ` to toggle background
nnoremap <leader>tg :call ToggleBackground()<CR>
" Terminal shortcuts for opening a floating terminal and lazygit
nnoremap <silent> <leader>te :FloatermNew --autoclose=2<CR>
nnoremap <silent> <leader>gg :FloatermNew --autoclose=2 --width=0.8 --height=0.8 lazygit<CR>
" Save buffer and switch to the next/previous one using Tab
nnoremap <silent> <tab> :if &modifiable && !&readonly && &modified <CR> :write<CR> :endif<CR>:bnext<CR>
nnoremap <silent> <s-tab> :if &modifiable && !&readonly && &modified <CR> :write<CR> :endif<CR>:bprevious<CR>
" Toggle ZoomWinTab
nnoremap <leader>z :ZoomWinTabToggle<CR>
" Replace current word
nnoremap <leader>rp :Replace <C-r>=expand("<cword>")<CR><Space>
nmap <leader>rn <Plug>(coc-rename)
" Applying code actions to the selected code block
" Example: `<leader>aap` for current paragraph
xmap <leader>a <Plug>(coc-codeaction-selected)
nmap <leader>a <Plug>(coc-codeaction-selected)
" Remap keys for applying code actions at the cursor position
nmap <leader>ac <Plug>(coc-codeaction-cursor)
" Remap keys for apply code actions affect whole buffer
nmap <leader>as <Plug>(coc-codeaction-source)
" Apply the most preferred quickfix action to fix diagnostic on the current line
nmap <leader>qf <Plug>(coc-fix-current)
" Remap keys for applying refactor code actions
nmap <silent> <leader>re <Plug>(coc-codeaction-refactor)
xmap <silent> <leader>rv <Plug>(coc-codeaction-refactor-selected)
nmap <silent> <leader>rv <Plug>(coc-codeaction-refactor-selected)
" Run the Code Lens action on the current line
nmap <leader>cl <Plug>(coc-codelens-action)

我自己先琢磨了几个可能的点，但拿不准：

• 我用Coc做补全，配置里有不少Coc的映射，会不会是rust-analyzer的默认配置有坑？毕竟我没在.vimrc里写Coc的具体Rust补全规则。
• 那个Tab键的补全映射：inoremap <expr> <Tab> pumvisible() ? "\<C-y>" : "\<Tab>"，当补全菜单出来时按Tab直接选当前项，会不会是这个导致补全时没正确展开括号的结构？
• 有没有可能是Rust语法相关的隐性配置和补全插件冲突了？不过我.vimrc里没单独装语法插件，应该是Coc自带的。

有没有大佬碰到过类似情况，或者从我的配置里看出问题了？麻烦给指条明路，谢谢啦！

内容来源于stack exchange