commit https://github.com/vim/vim/commit/73dfe917ba6357413aaf98a021c91add5ac6e9bc Author: Bram Moolenaar <Bram@vim.org> Date: Sat Apr 23 13:54:48 2016 +0200 patch 7.4.1779 Problem: Using negative index in strcharpart(). (Yegappan Lakshmanan) Solution: Assume single byte when using a negative iindex.

Test for Bufleave autocommand that deletes the buffer we are about to edit.

STARTTEST
:so small.vim
:au BufLeave test9.in bwipe yy
:e yy
:/^start of/,$w! test.out      " Write contents of this file
:qa!
ENDTEST

start of test file xx
end of test file xx