Patch 8.0.1589
Problem:    Error for setting 'modifiable' when resetting it.
Solution:   Check if 'modifiable' was actually set.
Files:      src/option.c


*** ../vim-8.0.1588/src/option.c        2018-03-04 20:14:08.252064314 +0100
--- src/option.c        2018-03-07 23:01:39.226681609 +0100
***************
*** 8190,8197 ****
      {
  # ifdef FEAT_TERMINAL
        /* Cannot set 'modifiable' when in Terminal mode. */
!       if (term_in_normal_mode()
!                        || (bt_terminal(curbuf) && !term_is_finished(curbuf)))
        {
            curbuf->b_p_ma = FALSE;
            return (char_u *)N_("E946: Cannot make a terminal with running job 
modifiable");
--- 8190,8197 ----
      {
  # ifdef FEAT_TERMINAL
        /* Cannot set 'modifiable' when in Terminal mode. */
!       if (curbuf->b_p_ma && (term_in_normal_mode() || (bt_terminal(curbuf)
!                     && curbuf->b_term != NULL && !term_is_finished(curbuf))))
        {
            curbuf->b_p_ma = FALSE;
            return (char_u *)N_("E946: Cannot make a terminal with running job 
modifiable");
*** ../vim-8.0.1588/src/version.c       2018-03-07 22:09:06.780257074 +0100
--- src/version.c       2018-03-07 22:57:51.768245446 +0100
***************
*** 768,769 ****
--- 768,771 ----
  {   /* Add new patch number below this line */
+ /**/
+     1589,
  /**/

-- 
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