commit https://github.com/vim/vim/commit/1d90a5a5af84250e226f8a9121e771f7b72aa894 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jul 1 11:59:47 2016 +0200 patch 7.4.1968 Problem: Invalid memory access with "\<C-">. Solution: Do not recognize this as a special character. (Dominique Pelle)

" 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