Patch 8.0.1425
Problem:    execute() does not work in completion of user command. (thinca)
Solution:   Switch off redir_off and restore it. (Ozaki Kiichi, closes #2492)
Files:      src/evalfunc.c, src/testdir/test_usercommands.vim


*** ../vim-8.0.1424/src/evalfunc.c      2017-12-21 20:27:40.768178638 +0100
--- src/evalfunc.c      2017-12-25 13:39:26.045929809 +0100
***************
*** 2886,2891 ****
--- 2886,2892 ----
      int               save_emsg_silent = emsg_silent;
      int               save_emsg_noredir = emsg_noredir;
      int               save_redir_execute = redir_execute;
+     int               save_redir_off = redir_off;
      garray_T  save_ga;
  
      rettv->vval.v_string = NULL;
***************
*** 2928,2933 ****
--- 2929,2935 ----
        save_ga = redir_execute_ga;
      ga_init2(&redir_execute_ga, (int)sizeof(char), 500);
      redir_execute = TRUE;
+     redir_off = FALSE;
  
      if (cmd != NULL)
        do_cmdline_cmd(cmd);
***************
*** 2958,2963 ****
--- 2960,2966 ----
      redir_execute = save_redir_execute;
      if (redir_execute)
        redir_execute_ga = save_ga;
+     redir_off = save_redir_off;
  
      /* "silent reg" or "silent echo x" leaves msg_col somewhere in the
       * line.  Put it back in the first column. */
*** ../vim-8.0.1424/src/testdir/test_usercommands.vim   2017-10-15 
22:07:35.211683156 +0200
--- src/testdir/test_usercommands.vim   2017-12-25 13:39:26.045929809 +0100
***************
*** 206,208 ****
--- 206,220 ----
    com! -complete=customlist,CustomComp DoCmd :
    call assert_fails("call feedkeys(':DoCmd \<C-D>', 'tx')", 'E117:')
  endfunc
+ 
+ func CallExecute(A, L, P)
+   " Drop first '\n'
+   return execute('echo "hi"')[1:]
+ endfunc
+ 
+ func Test_use_execute_in_completion()
+   command! -nargs=* -complete=custom,CallExecute DoExec :
+   call feedkeys(":DoExec \<C-A>\<C-B>\"\<CR>", 'tx')
+   call assert_equal('"DoExec hi', @:)
+   delcommand DoExec
+ endfunc
*** ../vim-8.0.1424/src/version.c       2017-12-23 18:41:31.137791160 +0100
--- src/version.c       2017-12-25 13:40:35.557612237 +0100
***************
*** 773,774 ****
--- 773,776 ----
  {   /* Add new patch number below this line */
+ /**/
+     1425,
  /**/

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