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)

" Test feedkeys() function.

func Test_feedkeys_x_with_empty_string()
  new
  call feedkeys("ifoo\<Esc>")
  call assert_equal('', getline('.'))
  call feedkeys('', 'x')
  call assert_equal('foo', getline('.'))

  " check it goes back to normal mode immediately.
  call feedkeys('i', 'x')
  call assert_equal('foo', getline('.'))
  quit!
endfunc