commit https://github.com/vim/vim/commit/7069bf18e1b1b7bc7640335e07d1022b5acc9048 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 7 20:39:53 2017 +0100 patch 8.0.0150: completion for :filter does not skip the pattern Problem: When the pattern of :filter does not have a separator then completion of the command fails. Solution: Skip over the pattern. (Ozaki Kiichi, clodes #1299)

" Common preparations for running tests.

" Make sure 'runtimepath' and 'packpath' does not include $HOME.
set rtp=$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after
if has('packages')
  let &packpath = &rtp
endif

" Only when the +eval feature is present. 
if 1
  " Make sure $HOME does not get read or written.
  let $HOME = '/does/not/exist'
endif