patch 8.0.1446: acessing freed memory after window command in auto command commit https://github.com/vim/vim/commit/6f361c991221e96d5068c77b854967d997b1529b Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jan 31 19:06:50 2018 +0100 patch 8.0.1446: acessing freed memory after window command in auto command Problem: Acessing freed memory after window command in auto command. (gy741) Solution: Adjust the pointer in the parent frame. (Christian Brabandt, closes #2467)

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