commit https://github.com/vim/vim/commit/bc7ce675b2d1c9fb58c067eff3edd59abc30aba4 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Aug 1 22:49:22 2016 +0200 patch 7.4.2143 Problem: A funccal is garbage collected while it can still be used. Solution: Set copyID in all referenced functions. Do not list lambda functions with ":function".

" 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