commit https://github.com/vim/vim/commit/df48fb456fb6bf63d94cad9b302ff01d8ee8d311 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jul 22 21:50:18 2016 +0200 patch 7.4.2090 Problem: Using submatch() in a lambda passed to substitute() is verbose. Solution: Use a static list and pass it as an optional argument to the function. Fix memory leak.

" Common preparations for running tests.

" Make sure 'runtimepath' does not include $HOME.
set rtp=$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after

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