commit https://github.com/vim/vim/commit/ca8b8d6956dd881de6446fc32c38e817a364a6cc Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 17 21:30:27 2016 +0100 patch 8.0.0092 Problem: C indenting does not support nested namespaces that C++ 17 has. Solution: Add check that passes double colon inside a name. (Pauli, closes https://github.com/vim/vim/issues/1214)

" 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