patch 8.0.1156: trouble from removing one -W argument from Perl CFLAGS commit https://github.com/vim/vim/commit/1ec96c926974208bd47710384c8202c47d0752d0 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Sep 27 21:42:08 2017 +0200 patch 8.0.1156: trouble from removing one -W argument from Perl CFLAGS Problem: Removing one -W argument from Perl CFLAGS may cause trouble. Solution: Remove all -W flags. (Christian Brabandt)

" 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