Patch 8.2.4503
Problem:    Vim9: there is no point in supporting :Print and :mode.
Solution:   Do not recognize :Print and :mode as commands. (closes #9870)
Files:      src/ex_docmd.c, src/testdir/test_vim9_script.vim


*** ../vim-8.2.4502/src/ex_docmd.c      2022-02-20 18:26:43.107537899 +0000
--- src/ex_docmd.c      2022-03-04 16:56:04.404457690 +0000
***************
*** 3752,3757 ****
--- 3752,3761 ----
                break;
            }
  
+       // :Print and :mode are not supported in Vim9 script
+       if (vim9 && (eap->cmdidx == CMD_mode || eap->cmdidx == CMD_Print))
+           eap->cmdidx = CMD_SIZE;
+ 
        // Do not recognize ":*" as the star command unless '*' is in
        // 'cpoptions'.
        if (eap->cmdidx == CMD_star && vim_strchr(p_cpo, CPO_STAR) == NULL)
*** ../vim-8.2.4502/src/testdir/test_vim9_script.vim    2022-03-03 
17:05:17.527121052 +0000
--- src/testdir/test_vim9_script.vim    2022-03-04 17:03:46.804008074 +0000
***************
*** 3589,3620 ****
    var lines =<< trim END
        ka
    END
!   v9.CheckDefFailure(lines, 'E476:')
!   v9.CheckScriptFailure(['vim9script'] + lines, 'E492:')
  
    lines =<< trim END
        :1ka
    END
!   v9.CheckDefFailure(lines, 'E476:')
!   v9.CheckScriptFailure(['vim9script'] + lines, 'E492:')
  
    lines =<< trim END
      t
    END
!   v9.CheckDefFailure(lines, 'E1100:')
!   v9.CheckScriptFailure(['vim9script'] + lines, 'E1100:')
  
    lines =<< trim END
      x
    END
!   v9.CheckDefFailure(lines, 'E1100:')
!   v9.CheckScriptFailure(['vim9script'] + lines, 'E1100:')
  
    lines =<< trim END
      xit
    END
!   v9.CheckDefFailure(lines, 'E1100:')
!   v9.CheckScriptFailure(['vim9script'] + lines, 'E1100:')
  enddef
  
  def Test_mapping_line_number()
--- 3589,3625 ----
    var lines =<< trim END
        ka
    END
!   v9.CheckDefAndScriptFailure(lines, ['E476:', 'E492:'])
  
    lines =<< trim END
        :1ka
    END
!   v9.CheckDefAndScriptFailure(lines, ['E476:', 'E492:'])
  
    lines =<< trim END
      t
    END
!   v9.CheckDefAndScriptFailure(lines, 'E1100:')
  
    lines =<< trim END
      x
    END
!   v9.CheckDefAndScriptFailure(lines, 'E1100:')
  
    lines =<< trim END
      xit
    END
!   v9.CheckDefAndScriptFailure(lines, 'E1100:')
! 
!   lines =<< trim END
!     Print
!   END
!   v9.CheckDefAndScriptFailure(lines, ['E476: Invalid command: Print', 'E492: 
Not an editor command: Print'])
! 
!   lines =<< trim END
!     mode 4
!   END
!   v9.CheckDefAndScriptFailure(lines, ['E476: Invalid command: mode 4', 'E492: 
Not an editor command: mode 4'])
  enddef
  
  def Test_mapping_line_number()
*** ../vim-8.2.4502/src/version.c       2022-03-04 14:51:02.283560533 +0000
--- src/version.c       2022-03-04 16:57:01.988402092 +0000
***************
*** 756,757 ****
--- 756,759 ----
  {   /* Add new patch number below this line */
+ /**/
+     4503,
  /**/

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