patch 8.2.1313: Vim9 script: cannot assign to environment variable Commit: https://github.com/vim/vim/commit/b5ed266037dea49024e00c4e1f9c89f3a9ebaa60 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jul 28 22:38:37 2020 +0200 patch 8.2.1313: Vim9 script: cannot assign to environment variable Problem: Vim9 script: cannot assign to environment variable. Solution: Recognize environment variable assignment. (closes https://github.com/vim/vim/issues/6548) Also options and registers.

" Tests for :undo

func Test_ex_undo()
  new ex-undo
  setlocal ul=10
  exe "normal ione\n\<Esc>"
  setlocal ul=10
  exe "normal itwo\n\<Esc>"
  setlocal ul=10
  exe "normal ithree\n\<Esc>"
  call assert_equal(4, line('$'))
  undo
  call assert_equal(3, line('$'))
  undo 1
  call assert_equal(2, line('$'))
  undo 0
  call assert_equal(1, line('$'))
  quit!
endfunc