我使用了很多插件——也许其中一个是罪魁祸首。这是我的 .vimrc，如果有人感兴趣：
" Character encoding (if this is not set, all manner of hell breaks loose when
" LC_CYTPE is set to anything unexpected.)
set encoding=utf-8
" Pre-plugin stuff
let g:Powerline_symbols = 'fancy' " Awesome forward-facing arrows for powerline
" let g:ctrlp_cmd = 'CtrlPMixed'
let g:ctrlp_switch_buffer = 2
let g:ctrlp_reuse_window = 'netrw\|help\|quickfix'
let g:ctrlp_clear_cache_on_exit = 1 " retain cache on exit (might mean I have to manually refresh every now and again)
let g:ctrlp_open_new_file = 't' " <c-y> opens file …vim ×1