patch 8.0.1263: others can read the swap file if a user is careless commit https://github.com/vim/vim/commit/5a73e0ca54c77e067c3b12ea6f35e3e8681e8cf8 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Nov 4 21:35:01 2017 +0100 patch 8.0.1263: others can read the swap file if a user is careless Problem: Others can read the swap file if a user is careless with his primary group. Solution: If the group permission allows for reading but the world permissions doesn't, make sure the group is right.

" Test if fnameescape is correct for special chars like !
function! Test_fnameescape()
  let fname = 'Xspa ce'
  let status = v:false
  try
    exe "w! " . fnameescape(fname)
    let status = v:true
  endtry
  call assert_true(status, "Space")
  call delete(fname)

  let fname = 'Xemark!'
  let status = v:false
  try
    exe "w! " . fnameescape(fname)
    let status = v:true
  endtry
  call assert_true(status, "ExclamationMark")
  call delete(fname)
endfunction