commit https://github.com/vim/vim/commit/4afc7c5d4a73340831077a02bfe1f74935e7f4a1 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Apr 3 14:56:52 2016 +0200 patch 7.4.1702 Problem: Using freed memory when parsing 'printoptions' fails. Solution: Save the old options and restore them in case of an error. (Dominique)

" 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