commit https://github.com/vim/vim/commit/1000565c3a2439c9a7c9759284814dbf3b8bc20d Author: Bram Moolenaar <Bram@vim.org> Date: Thu Dec 31 21:03:23 2015 +0100 patch 7.4.1012 Problem: Vim overwrites the value of $PYTHONHOME. Solution: Do not set $PYTHONHOME if it is already set. (Kazuki Sakamoto, closes https://github.com/vim/vim/issues/500)

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