patch 8.0.0655: not easy to make sure a function does not exist commit https://github.com/vim/vim/commit/d6abcd154cdc6a8dd4b7c6ccad37617ea8a1b4aa Author: Bram Moolenaar <Bram@vim.org> Date: Thu Jun 22 19:15:24 2017 +0200 patch 8.0.0655: not easy to make sure a function does not exist Problem: Not easy to make sure a function does not exist. Solution: Add ! as an optional argument to :delfunc.

" Tests for not doing smart indenting when it isn't set.
function! Test_nosmartindent()
  new
  call append(0, ["		some test text",
      	\ "		test text",
      	\ "test text",
      	\ "		test text"])
  set nocindent nosmartindent autoindent
  exe "normal! gg/some\<CR>"
  exe "normal! 2cc#test\<Esc>"
  call assert_equal("		#test", getline(1))
  enew! | close
endfunction