patch 8.1.1310: named function arguments are never optional commit https://github.com/vim/vim/commit/42ae78cfff171fbd7412306083fe200245d7a7a6 Author: Bram Moolenaar <Bram@vim.org> Date: Thu May 9 21:08:58 2019 +0200 patch 8.1.1310: named function arguments are never optional Problem: Named function arguments are never optional. Solution: Support optional function arguments with a default value. (Andy Massimino, closes #3952)

" 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