commit https://github.com/vim/vim/commit/dc0ccaee68ca24d10050117fbec757ad33590a17 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Oct 9 17:28:01 2016 +0200 patch 8.0.0027 Problem: A channel is closed when reading on stderr or stdout fails, but there may still be something to read on another part. Solution: Turn ch_to_be_closed into a bitfield. (Ozaki Kiichi)

" Tests for :undo

func Test_ex_undo()
  new ex-undo
  setlocal ul=10
  exe "normal ione\n\<Esc>"
  setlocal ul=10
  exe "normal itwo\n\<Esc>"
  setlocal ul=10
  exe "normal ithree\n\<Esc>"
  call assert_equal(4, line('$'))
  undo
  call assert_equal(3, line('$'))
  undo 1
  call assert_equal(2, line('$'))
  undo 0
  call assert_equal(1, line('$'))
  quit!
endfunc