patch 8.1.1305: there is no easy way to manipulate environment variables commit https://github.com/vim/vim/commit/691ddeefb545d8488e5a495af61caba2e57b3de9 Author: Bram Moolenaar <Bram@vim.org> Date: Thu May 9 14:52:41 2019 +0200 patch 8.1.1305: there is no easy way to manipulate environment variables Problem: There is no easy way to manipulate environment variables. Solution: Add environ(), getenv() and setenv(). (Yasuhiro Matsumoto, closes #2875)

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