patch 8.0.0269: may get ml_get error when :perldo deletes lines commit https://github.com/vim/vim/commit/85b5743d3e69f96882b6124d4b4ebf873ca24707 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jan 29 22:59:12 2017 +0100 patch 8.0.0269: may get ml_get error when :perldo deletes lines Problem: May get ml_get error when :perldo deletes lines or switches to another buffer. (Nikolai Pavlov, issue https://github.com/vim/vim/issues/1421) Solution: Check the buffer and line every time.

" Test for joining lines.

func Test_join_with_count()
  new
  call setline(1, ['one', 'two', 'three', 'four'])
  normal J
  call assert_equal('one two', getline(1))
  %del
  call setline(1, ['one', 'two', 'three', 'four'])
  normal 10J
  call assert_equal('one two three four', getline(1))
  quit!
endfunc