patch 8.1.0538: evaluating a modeline might invoke using a shell command commit https://github.com/vim/vim/commit/5958f95a40a4a44bd9e7f3b7ec6554a6ef3e42ca Author: Bram Moolenaar <Bram@vim.org> Date: Tue Nov 20 04:25:21 2018 +0100 patch 8.1.0538: evaluating a modeline might invoke using a shell command Problem: Evaluating a modeline might invoke using a shell command. (Paul Huber) Solution: Set the sandbox flag when setting options from a modeline.

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