commit https://github.com/vim/vim/commit/bc96c29ffc753daef302d20322d1e3d560094f44 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Dec 3 20:46:20 2015 +0100 patch 7.4.957 Problem: Test_tagcase fails when using another language than English. Solution: Set the messages language to C. (Kenichi Ito)

" For Yiddish capitals should not be checked.  But only change the
" 'spellcapcheck' option when it is not at its default value.
let s:spc = &l:spc
setlocal spc&
if s:spc == &l:spc
  setlocal spc=
else
  let &l:spc = s:spc
endif
unlet s:spc