commit https://github.com/vim/vim/commit/f71d7b9ee5ceba75f70c30845332ddd728fd16c6 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 9 22:14:05 2016 +0200 patch 7.4.2189 Problem: Cannot detect encoding in a fifo. Solution: Extend the stdin way of detecting encoding to fifo. Add a test for detecting encoding on stdin and fifo. (Ken Takata)

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