patch 8.0.1748: CmdlineEnter command uses backslash instead of slash commit https://github.com/vim/vim/commit/a4baf5b32519855bb176a7aa0e9397c137ca890a Author: Bram Moolenaar <Bram@vim.org> Date: Sun Apr 22 13:27:44 2018 +0200 patch 8.0.1748: CmdlineEnter command uses backslash instead of slash Problem: CmdlineEnter command uses backslash instead of slash. Solution: Don't treat the character as a file name. (closes https://github.com/vim/vim/issues/2837)

" 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