commit https://github.com/vim/vim/commit/4d585022023b96f6507e8cae5ed8fc8d926f5140 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Apr 14 19:50:22 2016 +0200 patch 7.4.1740 Problem: syn-cchar defined with matchadd() does not appear if there are no other syntax definitions which matches buffer text. Solution: Check for startcol. (Ozaki Kiichi, haya14busa, closes https://github.com/vim/vim/issues/757)

Tests for writefile()

STARTTEST
:source small.vim
:%delete _
:let f = tempname()
:call writefile(["over","written"], f, "b")
:call writefile(["hello","world"], f, "b")
:call writefile(["!", "good"], f, "a")
:call writefile(["morning"], f, "ab")
:call writefile(["", "vimmers"], f, "ab")
:bwipeout!
:$put =readfile(f)
:1 delete _
:w! test.out
:call delete(f)
:qa!
ENDTEST