patch 8.2.0341: using ":for" in Vim9 script gives an error

Problem:    Using ":for" in Vim9 script gives an error.
Solution:   Pass the LET_NO_COMMAND flag. (closes #5715)

Author: brammool

src/eval.c

@@ -1491,6 +1491,8 @@ next_for_item(void *fi_void, char_u *arg)
 {
     forinfo_T	*fi = (forinfo_T *)fi_void;
     int		result;
+    int		flag = current_sctx.sc_version == SCRIPT_VERSION_VIM9 ?
+							LET_NO_COMMAND : 0;
     listitem_T	*item;
 
     if (fi->fi_blob != NULL)
@@ -1504,7 +1506,7 @@ next_for_item(void *fi_void, char_u *arg)
 	tv.vval.v_number = blob_get(fi->fi_blob, fi->fi_bi);
 	++fi->fi_bi;
 	return ex_let_vars(arg, &tv, TRUE, fi->fi_semicolon,
-					       fi->fi_varcount, 0, NULL) == OK;
+				       fi->fi_varcount, flag, NULL) == OK;
     }
 
     item = fi->fi_lw.lw_item;
@@ -1514,7 +1516,7 @@ next_for_item(void *fi_void, char_u *arg)
     {
 	fi->fi_lw.lw_item = item->li_next;
 	result = (ex_let_vars(arg, &item->li_tv, TRUE, fi->fi_semicolon,
-					  fi->fi_varcount, 0, NULL) == OK);
+				      fi->fi_varcount, flag, NULL) == OK);
     }
     return result;
 }

src/testdir/test_vim9_script.vim

@@ -775,5 +775,19 @@ def Test_echo_cmd()
   assert_match('^some more$', Screenline(&lines))
 enddef
 
+def Test_for_outside_of_function()
+  let lines =<< trim END
+    vim9script
+    new
+    for var in range(0, 3)
+      append(line('$'), var)
+    endfor
+    assert_equal(['', '0', '1', '2', '3'], getline(1, '$'))
+    bwipe!
+  END
+  writefile(lines, 'Xvim9for.vim')
+  source Xvim9for.vim
+  delete('Xvim9for.vim')
+enddef
 
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    341,
 /**/
     340,
 /**/