無理矢理NeoBundleのautoloadのcommandの補完関数にスクリプトローカル関数を指定する例

.vimrc

set encoding=utf-8
scriptencoding utf-8

if has('vim_starting')
  set rtp+=~/.vim/bundle/neobundle.vim
endif
call neobundle#begin()
NeoBundleFetch 'Shougo/neobundle.vim'

let g:neobundle#default_options = {'_': {'verbose': 1}}
augroup CompleteDummy
  autocmd!
augroup END

function! s:SID() abort
  return matchstr(expand('<sfile>'), '<SNR>\zs\d\+\ze_SID$')
endfun
let s:sid = s:SID()
delfunction s:SID

function! s:to_global_name(scriptlocal_funcname) abort
  return '<SNR>' . s:sid . '_' . a:scriptlocal_funcname
endfunction

" 適当なイベントが発生したら，補完関数を消去
function! s:delete_function_lazy(funcname) abort
  execute 'autocmd CompleteDummy CursorHold,CursorHoldI,CursorMoved,CursorMovedI,InsertEnter *'
        \ 'delfunction' a:funcname
        \ '| autocmd! CompleteDummy CursorHold,CursorHoldI,CursorMoved,CursorMovedI,InsertEnter *'
endfunction

if neobundle#load_cache()
  NeoBundleLazy 'osyo-manga/vim-reanimate'
  " キャッシュされる設定はこっちに書く
  if neobundle#tap('vim-reanimate')
    let s:_ = 'customlist,' . s:to_global_name('reanimate_save_point_completelist')
    call neobundle#config({
          \ 'autoload': {
          \   'commands': [
          \     {'name': 'ReanimateSave', 'complete': s:_},
          \     'ReanimateSaveCursorHold',
          \     'ReanimateSaveInput',
          \     {'name': 'ReanimateLoad', 'complete': s:_},
          \     'ReanimateLoadInput',
          \     'ReanimateLoadLatest',
          \     {'name': 'ReanimateSwitch', 'complete': s:_},
          \     {'name': 'ReanimateEditVimrcLocal', 'complete': s:_},
          \     'ReanimateUnLoad'
          \   ]
          \ }
          \})
    unlet s:_
    call neobundle#untap()
  endif
  NeoBundleSaveCache
endif
call neobundle#end()

" キャッシュされないグローバル変数の設定等がこっち
if neobundle#tap('vim-reanimate')
  " plugin/reanimate.vim を見て実装
  function! s:reanimate_save_point_completelist(arglead, ...) abort
    return filter(reanimate#save_points(), "v:val =~? '" . a:arglead . "'")
  endfunction
  " neobundle#tapped.hooks.on_source() でもいい
  function! neobundle#tapped.hooks.on_post_source(bundle) abort
    " 仮のコマンド定義から実際のコマンド定義になる．
    " 従って，一時的な補完関数は不必要になるので消去
    call s:delete_function_lazy('s:reanimate_save_point_completelist')
  endfunction
  let g:reanimate_save_dir = '~/.vim/save'
  let g:reanimate_default_save_name = 'reanimate'
  let g:reanimate_sessionoptions = 'curdir,folds,help,localoptions,slash,tabpages,winsize'
  call neobundle#untap()
endif

if !has('vim_starting')
  call neobundle#call_hook('on_source')
endif
filetype plugin indent on