commit https://github.com/vim/vim/commit/da59dd5da6440c3410866ed61ce169a2012ba5bd Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 5 21:59:58 2016 +0100 patch 7.4.1053 Problem: Insufficient testing for quickfix commands. Solution: Add a new style quickfix test. (Yegappan Lakshmanan)

Test if fnameescape is correct for special chars like !

STARTTEST
:so small.vim
:%d
:let fname = 'Xspa ce'
:try | exe "w! " . fnameescape(fname) | put='Space' | endtry 
:let fname = 'Xemark!'
:try | exe "w! " . fnameescape(fname) | put='ExclamationMark' | endtry
:w! test.out
:qa!
ENDTEST