diff --git a/src/channel.c b/src/channel.c
index 0bfeeac..8977686 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -1392,11 +1392,8 @@
 
     address = tv_get_string(&argvars[0]);
     if (argvars[1].v_type != VAR_UNKNOWN
-	 && (argvars[1].v_type != VAR_DICT || argvars[1].vval.v_dict == NULL))
-    {
-	emsg(_(e_invalid_argument));
+	    && check_for_nonnull_dict_arg(argvars, 1) == FAIL)
 	return NULL;
-    }
 
     if (*address == NUL)
     {
@@ -4601,11 +4598,9 @@
 	if (rettv_dict_alloc(rettv) == FAIL)
 	    return;
 
-	if (argvars[1].v_type != VAR_DICT)
-	{
-	    semsg(_(e_dict_required_for_argument_nr), 2);
+	if (check_for_dict_arg(argvars, 1) == FAIL)
 	    return;
-	}
+
 	d = argvars[1].vval.v_dict;
 	di = dict_find(d, (char_u *)"id", -1);
 	if (di != NULL && di->di_tv.v_type != VAR_NUMBER)
diff --git a/src/dict.c b/src/dict.c
index 58fd68a..874b823 100644
--- a/src/dict.c
+++ b/src/dict.c
@@ -1578,11 +1578,9 @@
 		|| check_for_string_or_number_arg(argvars, 1) == FAIL))
 	return;
 
-    if (argvars[0].v_type != VAR_DICT)
-    {
-	emsg(_(e_dictionary_required));
+    if (check_for_dict_arg(argvars, 0) == FAIL)
 	return;
-    }
+
     if (argvars[0].vval.v_dict == NULL)
 	return;
 
diff --git a/src/errors.h b/src/errors.h
index 9d987c9..1784430 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -3318,3 +3318,5 @@
 EXTERN char e_can_only_use_left_padding_when_column_is_zero[]
 	INIT(= N_("E1296: Can only use left padding when column is zero"));
 #endif
+EXTERN char e_non_null_dict_required_for_argument_nr[]
+	INIT(= N_("E1297: Non-NULL Dictionary required for argument %d"));
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 92c3269..be1b2e7 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -3277,11 +3277,9 @@
 
     if (argvars[2].v_type != VAR_UNKNOWN)
     {
-	if (argvars[2].v_type != VAR_DICT)
-	{
-	    emsg(_(e_dictionary_required));
+	if (check_for_dict_arg(argvars, 2) == FAIL)
 	    return;
-	}
+
 	selfdict = argvars[2].vval.v_dict;
     }
 
@@ -4501,9 +4499,8 @@
 		arg_idx = 1;
 	    if (dict_idx > 0)
 	    {
-		if (argvars[dict_idx].v_type != VAR_DICT)
+		if (check_for_dict_arg(argvars, dict_idx) == FAIL)
 		{
-		    emsg(_(e_expected_dict));
 		    vim_free(name);
 		    goto theend;
 		}
@@ -9291,15 +9288,9 @@
     dictitem_T	*di;
     char_u	*csearch;
 
-    if (in_vim9script() && check_for_dict_arg(argvars, 0) == FAIL)
+    if (check_for_dict_arg(argvars, 0) == FAIL)
 	return;
 
-    if (argvars[0].v_type != VAR_DICT)
-    {
-	emsg(_(e_dictionary_required));
-	return;
-    }
-
     if ((d = argvars[0].vval.v_dict) != NULL)
     {
 	csearch = dict_get_string(d, "char", FALSE);
@@ -9637,11 +9628,8 @@
 	return;
 
     // second argument: dict with items to set in the tag stack
-    if (argvars[1].v_type != VAR_DICT)
-    {
-	emsg(_(e_dictionary_required));
+    if (check_for_dict_arg(argvars, 1) == FAIL)
 	return;
-    }
     d = argvars[1].vval.v_dict;
     if (d == NULL)
 	return;
diff --git a/src/evalwindow.c b/src/evalwindow.c
index d507ab3..906c269 100644
--- a/src/evalwindow.c
+++ b/src/evalwindow.c
@@ -1009,11 +1009,8 @@
 	dict_T      *d;
 	dictitem_T  *di;
 
-	if (argvars[2].v_type != VAR_DICT || argvars[2].vval.v_dict == NULL)
-	{
-	    emsg(_(e_invalid_argument));
+	if (check_for_nonnull_dict_arg(argvars, 2) == FAIL)
 	    return;
-	}
 
 	d = argvars[2].vval.v_dict;
 	if (dict_get_bool(d, "vertical", FALSE))
@@ -1227,50 +1224,45 @@
 {
     dict_T	*dict;
 
-    if (in_vim9script() && check_for_dict_arg(argvars, 0) == FAIL)
+    if (check_for_nonnull_dict_arg(argvars, 0) == FAIL)
 	return;
 
-    if (argvars[0].v_type != VAR_DICT
-	    || (dict = argvars[0].vval.v_dict) == NULL)
-	emsg(_(e_invalid_argument));
-    else
+    dict = argvars[0].vval.v_dict;
+    if (dict_has_key(dict, "lnum"))
+	curwin->w_cursor.lnum = (linenr_T)dict_get_number(dict, "lnum");
+    if (dict_has_key(dict, "col"))
+	curwin->w_cursor.col = (colnr_T)dict_get_number(dict, "col");
+    if (dict_has_key(dict, "coladd"))
+	curwin->w_cursor.coladd = (colnr_T)dict_get_number(dict, "coladd");
+    if (dict_has_key(dict, "curswant"))
     {
-	if (dict_has_key(dict, "lnum"))
-	    curwin->w_cursor.lnum = (linenr_T)dict_get_number(dict, "lnum");
-	if (dict_has_key(dict, "col"))
-	    curwin->w_cursor.col = (colnr_T)dict_get_number(dict, "col");
-	if (dict_has_key(dict, "coladd"))
-	    curwin->w_cursor.coladd = (colnr_T)dict_get_number(dict, "coladd");
-	if (dict_has_key(dict, "curswant"))
-	{
-	    curwin->w_curswant = (colnr_T)dict_get_number(dict, "curswant");
-	    curwin->w_set_curswant = FALSE;
-	}
-
-	if (dict_has_key(dict, "topline"))
-	    set_topline(curwin, (linenr_T)dict_get_number(dict, "topline"));
-#ifdef FEAT_DIFF
-	if (dict_has_key(dict, "topfill"))
-	    curwin->w_topfill = (int)dict_get_number(dict, "topfill");
-#endif
-	if (dict_has_key(dict, "leftcol"))
-	    curwin->w_leftcol = (colnr_T)dict_get_number(dict, "leftcol");
-	if (dict_has_key(dict, "skipcol"))
-	    curwin->w_skipcol = (colnr_T)dict_get_number(dict, "skipcol");
-
-	check_cursor();
-	win_new_height(curwin, curwin->w_height);
-	win_new_width(curwin, curwin->w_width);
-	changed_window_setting();
-
-	if (curwin->w_topline <= 0)
-	    curwin->w_topline = 1;
-	if (curwin->w_topline > curbuf->b_ml.ml_line_count)
-	    curwin->w_topline = curbuf->b_ml.ml_line_count;
-#ifdef FEAT_DIFF
-	check_topfill(curwin, TRUE);
-#endif
+	curwin->w_curswant = (colnr_T)dict_get_number(dict, "curswant");
+	curwin->w_set_curswant = FALSE;
     }
+
+    if (dict_has_key(dict, "topline"))
+	set_topline(curwin, (linenr_T)dict_get_number(dict, "topline"));
+#ifdef FEAT_DIFF
+    if (dict_has_key(dict, "topfill"))
+	curwin->w_topfill = (int)dict_get_number(dict, "topfill");
+#endif
+    if (dict_has_key(dict, "leftcol"))
+	curwin->w_leftcol = (colnr_T)dict_get_number(dict, "leftcol");
+    if (dict_has_key(dict, "skipcol"))
+	curwin->w_skipcol = (colnr_T)dict_get_number(dict, "skipcol");
+
+    check_cursor();
+    win_new_height(curwin, curwin->w_height);
+    win_new_width(curwin, curwin->w_width);
+    changed_window_setting();
+
+    if (curwin->w_topline <= 0)
+	curwin->w_topline = 1;
+    if (curwin->w_topline > curbuf->b_ml.ml_line_count)
+	curwin->w_topline = curbuf->b_ml.ml_line_count;
+#ifdef FEAT_DIFF
+    check_topfill(curwin, TRUE);
+#endif
 }
 
 /*
diff --git a/src/list.c b/src/list.c
index a6805ed..7bc34db 100644
--- a/src/list.c
+++ b/src/list.c
@@ -2236,11 +2236,8 @@
     if (argvars[2].v_type != VAR_UNKNOWN)
     {
 	// optional third argument: {dict}
-	if (argvars[2].v_type != VAR_DICT)
-	{
-	    emsg(_(e_dictionary_required));
+	if (check_for_dict_arg(argvars, 2) == FAIL)
 	    return FAIL;
-	}
 	info->item_compare_selfdict = argvars[2].vval.v_dict;
     }
 
diff --git a/src/map.c b/src/map.c
index 3516f7a..f870b96 100644
--- a/src/map.c
+++ b/src/map.c
@@ -2635,11 +2635,8 @@
 	    return;
 	is_abbr = (int)tv_get_bool(&argvars[1]);
 
-	if (argvars[2].v_type != VAR_DICT)
-	{
-	    emsg(_(e_dictionary_required));
+	if (check_for_dict_arg(argvars, 2) == FAIL)
 	    return;
-	}
 	d = argvars[2].vval.v_dict;
     }
     mode = get_map_mode_string(which, is_abbr);
diff --git a/src/popupwin.c b/src/popupwin.c
index 7459b98..2f9df8d 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -2016,11 +2016,8 @@
 	    emsg(_(e_buffer_number_text_or_list_required));
 	    return NULL;
 	}
-	if (argvars[1].v_type != VAR_DICT || argvars[1].vval.v_dict == NULL)
-	{
-	    emsg(_(e_dictionary_required));
+	if (check_for_nonnull_dict_arg(argvars, 1) == FAIL)
 	    return NULL;
-	}
 	d = argvars[1].vval.v_dict;
     }
 
@@ -2928,11 +2925,8 @@
     if (wp == NULL)
 	return;  // invalid {id}
 
-    if (argvars[1].v_type != VAR_DICT || argvars[1].vval.v_dict == NULL)
-    {
-	emsg(_(e_dictionary_required));
+    if (check_for_nonnull_dict_arg(argvars, 1) == FAIL)
 	return;
-    }
     dict = argvars[1].vval.v_dict;
 
     apply_move_options(wp, dict);
@@ -2963,11 +2957,8 @@
     if (wp == NULL)
 	return;  // invalid {id}
 
-    if (argvars[1].v_type != VAR_DICT || argvars[1].vval.v_dict == NULL)
-    {
-	emsg(_(e_dictionary_required));
+    if (check_for_nonnull_dict_arg(argvars, 1) == FAIL)
 	return;
-    }
     dict = argvars[1].vval.v_dict;
     old_firstline = wp->w_firstline;
 
diff --git a/src/proto/typval.pro b/src/proto/typval.pro
index 6a8d0ac..154b668 100644
--- a/src/proto/typval.pro
+++ b/src/proto/typval.pro
@@ -22,6 +22,7 @@
 int check_for_list_arg(typval_T *args, int idx);
 int check_for_opt_list_arg(typval_T *args, int idx);
 int check_for_dict_arg(typval_T *args, int idx);
+int check_for_nonnull_dict_arg(typval_T *args, int idx);
 int check_for_opt_dict_arg(typval_T *args, int idx);
 int check_for_chan_or_job_arg(typval_T *args, int idx);
 int check_for_opt_chan_or_job_arg(typval_T *args, int idx);
diff --git a/src/search.c b/src/search.c
index 9f1a80a..0c2a990 100644
--- a/src/search.c
+++ b/src/search.c
@@ -764,7 +764,7 @@
 		col = at_first_line && (options & SEARCH_COL) ? pos->col
 								 : (colnr_T)0;
 		nmatched = vim_regexec_multi(&regmatch, win, buf,
-					     lnum, col, timed_out);
+							 lnum, col, timed_out);
 		// vim_regexec_multi() may clear "regprog"
 		if (regmatch.regprog == NULL)
 		    break;
@@ -1072,11 +1072,11 @@
 	     * twice.
 	     */
 	    if (!p_ws || stop_lnum != 0 || got_int
-			        || called_emsg > called_emsg_before || *timed_out
+			      || called_emsg > called_emsg_before || *timed_out
 #ifdef FEAT_SEARCH_EXTRA
-				|| break_loop
+			      || break_loop
 #endif
-				|| found || loop)
+			      || found || loop)
 		break;
 
 	    /*
@@ -4095,11 +4095,8 @@
 	listitem_T	*li;
 	int		error = FALSE;
 
-	if (argvars[0].v_type != VAR_DICT || argvars[0].vval.v_dict == NULL)
-	{
-	    emsg(_(e_dictionary_required));
+	if (check_for_nonnull_dict_arg(argvars, 0) == FAIL)
 	    return;
-	}
 	dict = argvars[0].vval.v_dict;
 	di = dict_find(dict, (char_u *)"timeout", -1);
 	if (di != NULL)
@@ -4815,11 +4812,8 @@
 	dict_T		*d;
 	dictitem_T	*di;
 
-	if (argvars[2].v_type != VAR_DICT || argvars[2].vval.v_dict == NULL)
-	{
-	    emsg(_(e_dictionary_required));
+	if (check_for_nonnull_dict_arg(argvars, 2) == FAIL)
 	    return;
-	}
 
 	// To search a dict, either a callback function or a key can be
 	// specified.
diff --git a/src/sign.c b/src/sign.c
index 1e36074..e0264cc 100644
--- a/src/sign.c
+++ b/src/sign.c
@@ -2349,11 +2349,8 @@
     if (name == NULL)
 	return;
 
-    if (argvars[1].v_type != VAR_UNKNOWN && argvars[1].v_type != VAR_DICT)
-    {
-	emsg(_(e_dictionary_required));
+    if (check_for_opt_dict_arg(argvars, 1) == FAIL)
 	return;
-    }
 
     rettv->vval.v_number = sign_define_from_dict(name,
 	    argvars[1].v_type == VAR_DICT ? argvars[1].vval.v_dict : NULL);
@@ -2411,12 +2408,9 @@
 
 	if (argvars[1].v_type != VAR_UNKNOWN)
 	{
-	    if (argvars[1].v_type != VAR_DICT ||
-				((dict = argvars[1].vval.v_dict) == NULL))
-	    {
-		emsg(_(e_dictionary_required));
+	    if (check_for_nonnull_dict_arg(argvars, 1) == FAIL)
 		return;
-	    }
+	    dict = argvars[1].vval.v_dict;
 	    if ((di = dict_find(dict, (char_u *)"lnum", -1)) != NULL)
 	    {
 		// get signs placed at this line
@@ -2640,12 +2634,11 @@
 		|| check_for_opt_dict_arg(argvars, 4) == FAIL))
 	return;
 
-    if (argvars[4].v_type != VAR_UNKNOWN
-	    && (argvars[4].v_type != VAR_DICT
-		|| ((dict = argvars[4].vval.v_dict) == NULL)))
+    if (argvars[4].v_type != VAR_UNKNOWN)
     {
-	emsg(_(e_dictionary_required));
-	return;
+	if (check_for_nonnull_dict_arg(argvars, 4) == FAIL)
+	    return;
+	dict = argvars[4].vval.v_dict;
     }
 
     rettv->vval.v_number = sign_place_from_dict(&argvars[0], &argvars[1],
@@ -2872,11 +2865,8 @@
 
     if (argvars[1].v_type != VAR_UNKNOWN)
     {
-	if (argvars[1].v_type != VAR_DICT)
-	{
-	    emsg(_(e_dictionary_required));
+	if (check_for_dict_arg(argvars, 1) == FAIL)
 	    return;
-	}
 	dict = argvars[1].vval.v_dict;
     }
 
diff --git a/src/terminal.c b/src/terminal.c
index c0fa125..0283267 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -4989,11 +4989,8 @@
     {
 	dict_T *d;
 
-	if (argvars[2].v_type != VAR_DICT)
-	{
-	    emsg(_(e_dictionary_required));
+	if (check_for_dict_arg(argvars, 2) == FAIL)
 	    return;
-	}
 	d = argvars[2].vval.v_dict;
 	if (d != NULL)
 	{
diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index 9f60bbc..6b595d0 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -1509,7 +1509,7 @@
   call assert_fails("let ch = ch_open('noserver')", 'E475:')
   echo ch
   let d = ch
-  call assert_fails("let ch = ch_open('noserver', 10)", 'E474:')
+  call assert_fails("let ch = ch_open('noserver', 10)", 'E1206:')
   call assert_fails("let ch = ch_open('localhost:-1')", 'E475:')
   call assert_fails("let ch = ch_open('localhost:65537')", 'E475:')
   call assert_fails("let ch = ch_open('localhost:8765', {'timeout' : -1})",
diff --git a/src/testdir/test_charsearch.vim b/src/testdir/test_charsearch.vim
index 06b8ff6..142e6c8 100644
--- a/src/testdir/test_charsearch.vim
+++ b/src/testdir/test_charsearch.vim
@@ -39,7 +39,7 @@
   call setcharsearch({'char' : ''})
   call assert_equal('', getcharsearch().char)
 
-  call assert_fails("call setcharsearch([])", 'E715:')
+  call assert_fails("call setcharsearch([])", 'E1206:')
   enew!
 endfunc
 
diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index 78d5919..3cd2a0d 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -113,7 +113,7 @@
   END
   call v9.CheckLegacyAndVim9Success(lines)
 
-  call v9.CheckLegacyAndVim9Failure(["VAR i = has_key([], 'a')"], ['E715:', 'E1013:', 'E1206:'])
+  call v9.CheckLegacyAndVim9Failure(["VAR i = has_key([], 'a')"], ['E1206:', 'E1013:', 'E1206:'])
 endfunc
 
 func Test_strgetchar()
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index b17a60d..971be40 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -2294,7 +2294,7 @@
   endfunction
   let mydict = {'data': [0, 1, 2, 3], 'len': function("Mylen")}
   eval mydict.len->call([], mydict)->assert_equal(4)
-  call assert_fails("call call('Mylen', [], 0)", 'E715:')
+  call assert_fails("call call('Mylen', [], 0)", 'E1206:')
   call assert_fails('call foo', 'E107:')
 
   " These once caused a crash.
diff --git a/src/testdir/test_listdict.vim b/src/testdir/test_listdict.vim
index 89c4243..154aa98 100644
--- a/src/testdir/test_listdict.vim
+++ b/src/testdir/test_listdict.vim
@@ -981,7 +981,7 @@
 
   call assert_fails('call reverse("")', 'E899:')
   call assert_fails('call uniq([1, 2], {x, y -> []})', 'E745:')
-  call assert_fails("call sort([1, 2], function('min'), 1)", "E715:")
+  call assert_fails("call sort([1, 2], function('min'), 1)", "E1206:")
   call assert_fails("call sort([1, 2], function('invalid_func'))", "E700:")
   call assert_fails("call sort([1, 2], function('min'))", "E118:")
 
diff --git a/src/testdir/test_map_functions.vim b/src/testdir/test_map_functions.vim
index d8c079c..79321a0 100644
--- a/src/testdir/test_map_functions.vim
+++ b/src/testdir/test_map_functions.vim
@@ -273,7 +273,7 @@
   bwipe!
 
   call assert_fails('call mapset([], v:false, {})', 'E730:')
-  call assert_fails('call mapset("i", 0, "")', 'E715:')
+  call assert_fails('call mapset("i", 0, "")', 'E1206:')
   call assert_fails('call mapset("i", 0, {})', 'E460:')
 endfunc
 
diff --git a/src/testdir/test_matchfuzzy.vim b/src/testdir/test_matchfuzzy.vim
index 26fe04d..502d136 100644
--- a/src/testdir/test_matchfuzzy.vim
+++ b/src/testdir/test_matchfuzzy.vim
@@ -67,14 +67,14 @@
   call assert_equal([{'id' : 6, 'val' : 'camera'}], matchfuzzy(l, 'cam', {'key' : 'val'}))
   call assert_equal([], matchfuzzy(l, 'day', {'text_cb' : {v -> v.val}}))
   call assert_equal([], matchfuzzy(l, 'day', {'key' : 'val'}))
-  call assert_fails("let x = matchfuzzy(l, 'cam', 'random')", 'E715:')
+  call assert_fails("let x = matchfuzzy(l, 'cam', 'random')", 'E1206:')
   call assert_equal([], matchfuzzy(l, 'day', {'text_cb' : {v -> []}}))
   call assert_equal([], matchfuzzy(l, 'day', {'text_cb' : {v -> 1}}))
   call assert_fails("let x = matchfuzzy(l, 'day', {'text_cb' : {a, b -> 1}})", 'E119:')
   call assert_equal([], matchfuzzy(l, 'cam'))
   call assert_fails("let x = matchfuzzy(l, 'cam', {'text_cb' : []})", 'E921:')
   call assert_fails("let x = matchfuzzy(l, 'foo', {'key' : []})", 'E730:')
-  call assert_fails("let x = matchfuzzy(l, 'cam', test_null_dict())", 'E715:')
+  call assert_fails("let x = matchfuzzy(l, 'cam', test_null_dict())", 'E1297:')
   call assert_fails("let x = matchfuzzy(l, 'foo', {'key' : test_null_string()})", 'E475:')
   call assert_fails("let x = matchfuzzy(l, 'foo', {'text_cb' : test_null_function()})", 'E475:')
   " matches with same score should not be reordered
@@ -140,14 +140,14 @@
         \ matchfuzzypos(l, 'cam', {'key' : 'val'}))
   call assert_equal([[], [], []], matchfuzzypos(l, 'day', {'text_cb' : {v -> v.val}}))
   call assert_equal([[], [], []], matchfuzzypos(l, 'day', {'key' : 'val'}))
-  call assert_fails("let x = matchfuzzypos(l, 'cam', 'random')", 'E715:')
+  call assert_fails("let x = matchfuzzypos(l, 'cam', 'random')", 'E1206:')
   call assert_equal([[], [], []], matchfuzzypos(l, 'day', {'text_cb' : {v -> []}}))
   call assert_equal([[], [], []], matchfuzzypos(l, 'day', {'text_cb' : {v -> 1}}))
   call assert_fails("let x = matchfuzzypos(l, 'day', {'text_cb' : {a, b -> 1}})", 'E119:')
   call assert_equal([[], [], []], matchfuzzypos(l, 'cam'))
   call assert_fails("let x = matchfuzzypos(l, 'cam', {'text_cb' : []})", 'E921:')
   call assert_fails("let x = matchfuzzypos(l, 'foo', {'key' : []})", 'E730:')
-  call assert_fails("let x = matchfuzzypos(l, 'cam', test_null_dict())", 'E715:')
+  call assert_fails("let x = matchfuzzypos(l, 'cam', test_null_dict())", 'E1297:')
   call assert_fails("let x = matchfuzzypos(l, 'foo', {'key' : test_null_string()})", 'E475:')
   call assert_fails("let x = matchfuzzypos(l, 'foo', {'text_cb' : test_null_function()})", 'E475:')
 
diff --git a/src/testdir/test_partial.vim b/src/testdir/test_partial.vim
index 392527f..4b054b5 100644
--- a/src/testdir/test_partial.vim
+++ b/src/testdir/test_partial.vim
@@ -88,7 +88,7 @@
   call assert_equal("Hello", dict.tr())
 
   call assert_fails("let F=function('setloclist', 10)", "E923:")
-  call assert_fails("let F=function('setloclist', [], [])", "E922:")
+  call assert_fails("let F=function('setloclist', [], [])", "E1206:")
 endfunc
 
 func Test_partial_implicit()
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 3a0f876..a92bd8b 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -1035,7 +1035,7 @@
 func Test_popup_invalid_arguments()
   call assert_fails('call popup_create(666, {})', 'E86:')
   call popup_clear()
-  call assert_fails('call popup_create("text", "none")', 'E715:')
+  call assert_fails('call popup_create("text", "none")', 'E1206:')
   call popup_clear()
   call assert_fails('call popup_create(test_null_string(), {})', 'E450:')
   call assert_fails('call popup_create(test_null_list(), {})', 'E450:')
@@ -1309,8 +1309,8 @@
   let line = join(map(range(1, 6), 'screenstring(1, v:val)'), '')
   call assert_equal('hworld', line)
 
-  call assert_fails('call popup_move(winid, [])', 'E715:')
-  call assert_fails('call popup_move(winid, test_null_dict())', 'E715:')
+  call assert_fails('call popup_move(winid, [])', 'E1206:')
+  call assert_fails('call popup_move(winid, test_null_dict())', 'E1297:')
 
   call popup_close(winid)
 
@@ -2577,8 +2577,8 @@
   call assert_equal(1, options.drag)
   call assert_equal('Another', options.highlight)
 
-  call assert_fails('call popup_setoptions(winid, [])', 'E715:')
-  call assert_fails('call popup_setoptions(winid, test_null_dict())', 'E715:')
+  call assert_fails('call popup_setoptions(winid, [])', 'E1206:')
+  call assert_fails('call popup_setoptions(winid, test_null_dict())', 'E1297:')
 
   call popup_close(winid)
   call assert_equal(0, popup_setoptions(winid, options.wrap))
diff --git a/src/testdir/test_search_stat.vim b/src/testdir/test_search_stat.vim
index e0820e4..71e050c 100644
--- a/src/testdir/test_search_stat.vim
+++ b/src/testdir/test_search_stat.vim
@@ -259,7 +259,7 @@
 endfunc
 
 func Test_searchcount_fails()
-  call assert_fails('echo searchcount("boo!")', 'E715:')
+  call assert_fails('echo searchcount("boo!")', 'E1206:')
   call assert_fails('echo searchcount({"timeout" : []})', 'E745:')
   call assert_fails('echo searchcount({"maxcount" : []})', 'E745:')
   call assert_fails('echo searchcount({"pattern" : []})', 'E730:')
diff --git a/src/testdir/test_signs.vim b/src/testdir/test_signs.vim
index 77bb049..e23d9ac 100644
--- a/src/testdir/test_signs.vim
+++ b/src/testdir/test_signs.vim
@@ -449,7 +449,7 @@
   call assert_fails('call sign_define("sign4", {"text" : "===>"})', 'E239:')
   call assert_fails('call sign_define("sign5", {"text" : ""})', 'E239:')
   call assert_fails('call sign_define({})', 'E731:')
-  call assert_fails('call sign_define("sign6", [])', 'E715:')
+  call assert_fails('call sign_define("sign6", [])', 'E1206:')
 
   " Tests for sign_getdefined()
   call assert_equal([], sign_getdefined("none"))
@@ -476,8 +476,7 @@
   " Tests for invalid arguments to sign_place()
   call assert_fails('call sign_place([], "", "mySign", 1)', 'E745:')
   call assert_fails('call sign_place(5, "", "mySign", -1)', 'E158:')
-  call assert_fails('call sign_place(-1, "", "sign1", "Xsign", [])',
-	      \ 'E715:')
+  call assert_fails('call sign_place(-1, "", "sign1", "Xsign", [])', 'E1206:')
   call assert_fails('call sign_place(-1, "", "sign1", "Xsign",
 	      \ {"lnum" : 30})', 'E474:')
   call assert_fails('call sign_place(10, "", "xsign1x", "Xsign",
@@ -512,7 +511,7 @@
   call assert_fails("call sign_getplaced('dummy.sign')", 'E158:')
   call assert_fails('call sign_getplaced("&")', 'E158:')
   call assert_fails('call sign_getplaced(-1)', 'E158:')
-  call assert_fails('call sign_getplaced("Xsign", [])', 'E715:')
+  call assert_fails('call sign_getplaced("Xsign", [])', 'E1206:')
   call assert_equal([{'bufnr' : bufnr(''), 'signs' : []}],
 	      \ sign_getplaced('Xsign', {'lnum' : 1000000}))
   call assert_fails("call sign_getplaced('Xsign', {'lnum' : []})",
@@ -535,7 +534,7 @@
 	      \ {'id' : 20, 'buffer' : '&'})", 'E158:')
   call assert_fails("call sign_unplace('g1',
 	      \ {'id' : 20, 'buffer' : 200})", 'E158:')
-  call assert_fails("call sign_unplace('g1', 'mySign')", 'E715:')
+  call assert_fails("call sign_unplace('g1', 'mySign')", 'E1206:')
 
   call sign_unplace('*')
 
@@ -1554,8 +1553,7 @@
 	      \ s[0].signs)
 
   " Error case
-  call assert_fails("call sign_place(1, 'g1', 'sign1', 'Xsign',
-	      \ [])", 'E715:')
+  call assert_fails("call sign_place(1, 'g1', 'sign1', 'Xsign', [])", 'E1206:')
   call assert_fails("call sign_place(1, 'g1', 'sign1', 'Xsign',
 	      \ {'priority' : []})", 'E745:')
   call sign_unplace('*')
diff --git a/src/testdir/test_tagjump.vim b/src/testdir/test_tagjump.vim
index 060cc3b..cca907f 100644
--- a/src/testdir/test_tagjump.vim
+++ b/src/testdir/test_tagjump.vim
@@ -403,7 +403,7 @@
   " Error cases
   call assert_equal({}, gettagstack(100))
   call assert_equal(-1, settagstack(100, {'items' : []}))
-  call assert_fails('call settagstack(1, [1, 10])', 'E715:')
+  call assert_fails('call settagstack(1, [1, 10])', 'E1206:')
   call assert_fails("call settagstack(1, {'items' : 10})", 'E714:')
   call assert_fails("call settagstack(1, {'items' : []}, 10)", 'E928:')
   call assert_fails("call settagstack(1, {'items' : []}, 'b')", 'E962:')
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index c398bb0..d325f19 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -1453,7 +1453,7 @@
   call assert_fails("call term_dumpwrite({}, 'Xtest.dump')", 'E728:')
   let buf = RunVimInTerminal('', {})
   call TermWait(buf)
-  call assert_fails("call term_dumpwrite(buf, 'Xtest.dump', '')", 'E715:')
+  call assert_fails("call term_dumpwrite(buf, 'Xtest.dump', '')", 'E1206:')
   call assert_fails("call term_dumpwrite(buf, [])", 'E730:')
   call writefile([], 'Xtest.dump')
   call assert_fails("call term_dumpwrite(buf, 'Xtest.dump')", 'E953:')
diff --git a/src/testdir/test_textprop.vim b/src/testdir/test_textprop.vim
index 7a2fcf6..34fa6c9 100644
--- a/src/testdir/test_textprop.vim
+++ b/src/testdir/test_textprop.vim
@@ -1679,14 +1679,14 @@
 func Test_prop_func_invalid_args()
   call assert_fails('call prop_clear(1, 2, [])', 'E715:')
   call assert_fails('call prop_clear(-1, 2)', 'E16:')
-  call assert_fails('call prop_find(test_null_dict())', 'E715:')
+  call assert_fails('call prop_find(test_null_dict())', 'E1297:')
   call assert_fails('call prop_find({"bufnr" : []})', 'E730:')
   call assert_fails('call prop_find({})', 'E968:')
   call assert_fails('call prop_find({}, "x")', 'E474:')
   call assert_fails('call prop_find({"lnum" : -2})', 'E16:')
-  call assert_fails('call prop_list(1, [])', 'E715:')
+  call assert_fails('call prop_list(1, [])', 'E1206:')
   call assert_fails('call prop_list(-1, {})', 'E16:')
-  call assert_fails('call prop_remove([])', 'E474:')
+  call assert_fails('call prop_remove([])', 'E1206:')
   call assert_fails('call prop_remove({}, -2)', 'E16:')
   call assert_fails('call prop_remove({})', 'E968:')
   call assert_fails('call prop_type_add([], {})', 'E730:')
@@ -1699,7 +1699,7 @@
   call assert_fails("call prop_type_add('yyy', 'not_a_dict')", 'E715:')
   call assert_fails("call prop_add(1, 5, {'type':'missing_type', 'length':1})", 'E971:')
   call assert_fails("call prop_add(1, 5, {'type': ''})", 'E971:')
-  call assert_fails('call prop_add(1, 1, 0)', 'E715:')
+  call assert_fails('call prop_add(1, 1, 0)', 'E1206:')
 
   new
   call setline(1, ['first', 'second'])
diff --git a/src/testdir/test_timers.vim b/src/testdir/test_timers.vim
index 338be10..85e76eb 100644
--- a/src/testdir/test_timers.vim
+++ b/src/testdir/test_timers.vim
@@ -265,7 +265,7 @@
   sleep 50m
   call assert_equal(3, g:call_count)
 
-  call assert_fails('call timer_start(100, "MyHandler", "abc")', 'E475:')
+  call assert_fails('call timer_start(100, "MyHandler", "abc")', 'E1206:')
   call assert_fails('call timer_start(100, [])', 'E921:')
   call assert_fails('call timer_stop("abc")', 'E39:')
 endfunc
diff --git a/src/testdir/test_window_cmd.vim b/src/testdir/test_window_cmd.vim
index e761c21..0fe0f11 100644
--- a/src/testdir/test_window_cmd.vim
+++ b/src/testdir/test_window_cmd.vim
@@ -745,7 +745,7 @@
 
   only!
   bwipe!
-  call assert_fails('call winrestview(test_null_dict())', 'E474:')
+  call assert_fails('call winrestview(test_null_dict())', 'E1297:')
 endfunc
 
 func Test_relative_cursor_position_after_move_and_resize()
@@ -946,7 +946,7 @@
   call assert_equal(view, winsaveview())
 
   bwipe!
-  call assert_fails('call winrestview(test_null_dict())', 'E474:')
+  call assert_fails('call winrestview(test_null_dict())', 'E1297:')
 endfunc
 
 func Test_win_splitmove()
@@ -977,7 +977,7 @@
   call assert_equal(bufname(winbufnr(2)), 'b')
   call assert_equal(bufname(winbufnr(3)), 'a')
   call assert_equal(bufname(winbufnr(4)), 'd')
-  call assert_fails('call win_splitmove(winnr(), winnr("k"), test_null_dict())', 'E474:')
+  call assert_fails('call win_splitmove(winnr(), winnr("k"), test_null_dict())', 'E1297:')
   only | bd
 
   call assert_fails('call win_splitmove(winnr(), 123)', 'E957:')
diff --git a/src/textprop.c b/src/textprop.c
index 0ba5c20..de3344f 100644
--- a/src/textprop.c
+++ b/src/textprop.c
@@ -149,11 +149,8 @@
 
     start_lnum = tv_get_number(&argvars[0]);
     start_col = tv_get_number(&argvars[1]);
-    if (argvars[2].v_type != VAR_DICT)
-    {
-	emsg(_(e_dictionary_required));
+    if (check_for_dict_arg(argvars, 2) == FAIL)
 	return;
-    }
 
     rettv->vval.v_number = prop_add_common(start_lnum, start_col,
 				 argvars[2].vval.v_dict, curbuf, &argvars[2]);
@@ -1045,11 +1042,8 @@
 		|| check_for_opt_string_arg(argvars, 1) == FAIL))
 	return;
 
-    if (argvars[0].v_type != VAR_DICT || argvars[0].vval.v_dict == NULL)
-    {
-	emsg(_(e_dictionary_required));
+    if (check_for_nonnull_dict_arg(argvars, 0) == FAIL)
 	return;
-    }
     dict = argvars[0].vval.v_dict;
 
     if (get_bufnr_from_arg(&argvars[0], &buf) == FAIL)
@@ -1396,11 +1390,8 @@
     {
 	dict_T *d;
 
-	if (argvars[1].v_type != VAR_DICT)
-	{
-	    emsg(_(e_dictionary_required));
+	if (check_for_dict_arg(argvars, 1) == FAIL)
 	    return;
-	}
 	d = argvars[1].vval.v_dict;
 
 	if (get_bufnr_from_arg(&argvars[1], &buf) == FAIL)
@@ -1499,11 +1490,8 @@
 		    && check_for_opt_number_arg(argvars, 2) == FAIL)))
 	return;
 
-    if (argvars[0].v_type != VAR_DICT || argvars[0].vval.v_dict == NULL)
-    {
-	emsg(_(e_invalid_argument));
+    if (check_for_nonnull_dict_arg(argvars, 0) == FAIL)
 	return;
-    }
 
     if (argvars[1].v_type != VAR_UNKNOWN)
     {
diff --git a/src/time.c b/src/time.c
index c28e7a9..d97c56e 100644
--- a/src/time.c
+++ b/src/time.c
@@ -872,12 +872,10 @@
     msec = (long)tv_get_number(&argvars[0]);
     if (argvars[2].v_type != VAR_UNKNOWN)
     {
-	if (argvars[2].v_type != VAR_DICT
-				   || (dict = argvars[2].vval.v_dict) == NULL)
-	{
-	    semsg(_(e_invalid_argument_str), tv_get_string(&argvars[2]));
+	if (check_for_nonnull_dict_arg(argvars, 2) == FAIL)
 	    return;
-	}
+
+	dict = argvars[2].vval.v_dict;
 	if (dict_has_key(dict, "repeat"))
 	    repeat = dict_get_number(dict, "repeat");
     }
diff --git a/src/typval.c b/src/typval.c
index 8b69adf..101f48f 100644
--- a/src/typval.c
+++ b/src/typval.c
@@ -533,6 +533,23 @@
 }
 
 /*
+ * Give an error and return FAIL unless "args[idx]" is a non-NULL dict.
+ */
+    int
+check_for_nonnull_dict_arg(typval_T *args, int idx)
+{
+    if (check_for_dict_arg(args, idx) == FAIL)
+	return FAIL;
+
+    if (args[idx].vval.v_dict == NULL)
+    {
+	semsg(_(e_non_null_dict_required_for_argument_nr), idx + 1);
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
  * Check for an optional dict argument at 'idx'
  */
     int
@@ -1179,7 +1196,7 @@
 
     if (type_is && tv1->v_type != tv2->v_type)
     {
-	// For "is" a different type always means FALSE, for "notis"
+	// For "is" a different type always means FALSE, for "isnot"
 	// it means TRUE.
 	n1 = (type == EXPR_ISNOT);
     }
diff --git a/src/version.c b/src/version.c
index dd60073..d0079d4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -708,6 +708,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    335,
+/**/
     334,
 /**/
     333,