patch 8.0.1410: hang when using count() with an empty string commit https://github.com/vim/vim/commit/338e47fdfdf0d918dae50a5cbf0cf4f7be45b4f0 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Dec 19 11:55:26 2017 +0100 patch 8.0.1410: hang when using count() with an empty string Problem: Hang when using count() with an empty string. Solution: Return zero for an empty string. (Dominique Pelle, closes https://github.com/vim/vim/issues/2465)

function Test_Comparators()
  try
    let oldisident=&isident
    set isident+=#
    call assert_equal(1, 1 is#1)
  finally
    let &isident=oldisident
  endtry
endfunction