patch 8.2.1329: Vim9: cannot define global function inside :def function Commit: https://github.com/vim/vim/commit/38ddf333f6b2806b0ea2dd052ee1cd50dd7f4525 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jul 31 22:05:04 2020 +0200 patch 8.2.1329: Vim9: cannot define global function inside :def function Problem: Vim9: cannot define global function inside :def function. Solution: Assign to global variable instead of local. (closes https://github.com/vim/vim/issues/6584)

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