patch 8.2.3188: Vim9: argument types are not checked at compile time

Problem:    Vim9: argument types are not checked at compile time.
Solution:   Add several more type checks, also at runtime. (Yegappan
            Lakshmanan, closes #8587)

src/blob.c

@@ -415,9 +415,16 @@ blob_set_range(blob_T *dest, long n1, long n2, typval_T *src)
 blob_remove(typval_T *argvars, typval_T *rettv)
 {
     int		error = FALSE;
-    long	idx = (long)tv_get_number_chk(&argvars[1], &error);
+    long	idx;
     long	end;
 
+    if (in_vim9script()
+	    && (check_for_blob_arg(argvars, 0) == FAIL
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_opt_number_arg(argvars, 2) == FAIL))
+	return;
+
+    idx = (long)tv_get_number_chk(&argvars[1], &error);
     if (!error)
     {
 	blob_T  *b = argvars[0].vval.v_blob;

src/channel.c

@@ -4270,6 +4270,11 @@ ch_expr_common(typval_T *argvars, typval_T *rettv, int eval)
     rettv->v_type = VAR_STRING;
     rettv->vval.v_string = NULL;
 
+    if (in_vim9script()
+	    && (check_for_chan_or_job_arg(argvars, 0) == FAIL
+		|| check_for_opt_dict_arg(argvars, 2) == FAIL))
+	return;
+
     channel = get_channel_arg(&argvars[0], TRUE, FALSE, 0);
     if (channel == NULL)
 	return;
@@ -4330,6 +4335,12 @@ ch_raw_common(typval_T *argvars, typval_T *rettv, int eval)
     rettv->v_type = VAR_STRING;
     rettv->vval.v_string = NULL;
 
+    if (in_vim9script()
+	    && (check_for_chan_or_job_arg(argvars, 0) == FAIL
+		|| check_for_string_or_blob_arg(argvars, 1) == FAIL
+		|| check_for_opt_dict_arg(argvars, 2) == FAIL))
+	return;
+
     if (argvars[1].v_type == VAR_BLOB)
     {
 	text = argvars[1].vval.v_blob->bv_ga.ga_data;
@@ -4815,9 +4826,16 @@ f_ch_close_in(typval_T *argvars, typval_T *rettv UNUSED)
     void
 f_ch_getbufnr(typval_T *argvars, typval_T *rettv)
 {
-    channel_T *channel = get_channel_arg(&argvars[0], FALSE, FALSE, 0);
+    channel_T *channel;
 
     rettv->vval.v_number = -1;
+
+    if (in_vim9script()
+	    && (check_for_chan_or_job_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL))
+	return;
+
+    channel = get_channel_arg(&argvars[0], FALSE, FALSE, 0);
     if (channel != NULL)
     {
 	char_u	*what = tv_get_string(&argvars[1]);
@@ -4894,6 +4912,7 @@ f_ch_logfile(typval_T *argvars, typval_T *rettv UNUSED)
     // Don't open a file in restricted mode.
     if (check_restricted() || check_secure())
 	return;
+
     if (in_vim9script()
 	    && (check_for_string_arg(argvars, 0) == FAIL
 		|| check_for_string_arg(argvars, 1) == FAIL))

src/clientserver.c

@@ -793,6 +793,15 @@ f_remote_expr(typval_T *argvars UNUSED, typval_T *rettv)
 {
     rettv->v_type = VAR_STRING;
     rettv->vval.v_string = NULL;
+
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL
+		|| check_for_opt_string_arg(argvars, 2) == FAIL
+		|| (argvars[2].v_type != VAR_UNKNOWN
+		    && check_for_opt_number_arg(argvars, 3) == FAIL)))
+	return;
+
 #ifdef FEAT_CLIENTSERVER
     remote_common(argvars, rettv, TRUE);
 #endif
@@ -891,8 +900,7 @@ f_remote_read(typval_T *argvars UNUSED, typval_T *rettv)
 
     if (in_vim9script()
 	    && (check_for_string_arg(argvars, 0) == FAIL
-		|| (argvars[1].v_type != VAR_UNKNOWN
+		|| check_for_opt_number_arg(argvars, 1) == FAIL))
-		    && check_for_number_arg(argvars, 1) == FAIL)))
 	return;
 
     serverid = tv_get_string_chk(&argvars[0]);
@@ -932,6 +940,13 @@ f_remote_send(typval_T *argvars UNUSED, typval_T *rettv)
 {
     rettv->v_type = VAR_STRING;
     rettv->vval.v_string = NULL;
+
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL
+		|| check_for_opt_string_arg(argvars, 2) == FAIL))
+	return;
+
 #ifdef FEAT_CLIENTSERVER
     remote_common(argvars, rettv, FALSE);
 #endif

src/cmdexpand.c

@@ -2891,6 +2891,12 @@ f_getcompletion(typval_T *argvars, typval_T *rettv)
     int		options = WILD_SILENT | WILD_USE_NL | WILD_ADD_SLASH
 								| WILD_NO_BEEP;
 
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL
+		|| check_for_opt_bool_arg(argvars, 2) == FAIL))
+	return;
+
     if (argvars[1].v_type != VAR_STRING)
     {
 	semsg(_(e_invarg2), "type must be a string");

src/cmdhist.c

@@ -599,8 +599,7 @@ f_histget(typval_T *argvars UNUSED, typval_T *rettv)
 
     if (in_vim9script()
 	    && (check_for_string_arg(argvars, 0) == FAIL
-		|| (argvars[1].v_type != VAR_UNKNOWN
+		|| check_for_opt_number_arg(argvars, 1) == FAIL))
-		    && check_for_number_arg(argvars, 1) == FAIL)))
 	return;
 
     str = tv_get_string_chk(&argvars[0]);	// NULL on type error

src/dict.c

@@ -1340,6 +1340,11 @@ dict_remove(typval_T *argvars, typval_T *rettv, char_u *arg_errmsg)
     char_u	*key;
     dictitem_T	*di;
 
+    if (in_vim9script()
+	    && (check_for_dict_arg(argvars, 0) == FAIL
+		|| check_for_string_or_number_arg(argvars, 1) == FAIL))
+	return;
+
     if (argvars[2].v_type != VAR_UNKNOWN)
 	semsg(_(e_toomanyarg), "remove()");
     else if ((d = argvars[0].vval.v_dict) != NULL

src/diff.c

@@ -3294,9 +3294,7 @@ f_diff_hlID(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
     int			col;
 
     if (in_vim9script()
-	    && ((argvars[0].v_type != VAR_STRING
+	    && (check_for_string_or_number_arg(argvars,0) == FAIL
-		    && argvars[0].v_type != VAR_NUMBER
-		    && check_for_string_arg(argvars, 0) == FAIL)
 		|| check_for_number_arg(argvars, 1) == FAIL))
 	return;
 

src/errors.h

@@ -520,3 +520,9 @@ EXTERN char e_digraph_argument_must_be_one_character_str[]
 EXTERN char e_setdigraphlist_argument_must_be_list_of_lists_with_two_items[]
 	INIT(= N_("E1216: setdigraphlist() argument must be a list of lists with two items"));
 #endif
+EXTERN char e_blob_required_for_argument_nr[]
+	INIT(= N_("E1217: Blob required for argument %d"));
+EXTERN char e_chan_or_job_required_for_argument_nr[]
+	INIT(= N_("E1218: Channel or Job required for argument %d"));
+EXTERN char e_job_required_for_argument_nr[]
+	INIT(= N_("E1219: Job required for argument %d"));

src/eval.c

@@ -4184,6 +4184,15 @@ check_can_index(typval_T *rettv, int evaluate, int verbose)
     void
 f_slice(typval_T *argvars, typval_T *rettv)
 {
+    if (in_vim9script()
+	    && ((argvars[0].v_type != VAR_LIST
+		    && argvars[0].v_type != VAR_BLOB
+		    && argvars[0].v_type != VAR_STRING
+		    && check_for_list_arg(argvars, 0) == FAIL)
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_opt_number_arg(argvars, 2) == FAIL))
+	return;
+
     if (check_can_index(argvars, TRUE, FALSE) == OK)
     {
 	copy_tv(argvars, rettv);

src/evalbuffer.c

@@ -387,6 +387,12 @@ f_bufnr(typval_T *argvars, typval_T *rettv)
     int		error = FALSE;
     char_u	*name;
 
+    if (in_vim9script()
+	    && (check_for_opt_string_or_number_arg(argvars, 0) == FAIL
+		|| (argvars[0].v_type != VAR_UNKNOWN
+		    && check_for_opt_bool_arg(argvars, 1) == FAIL)))
+	return;
+
     if (argvars[0].v_type == VAR_UNKNOWN)
 	buf = curbuf;
     else
@@ -459,6 +465,12 @@ f_deletebufline(typval_T *argvars, typval_T *rettv)
     tabpage_T	*tp;
     win_T	*wp;
 
+    if (in_vim9script()
+	    && (check_for_buffer_arg(argvars, 0) == FAIL
+		|| check_for_lnum_arg(argvars, 1) == FAIL
+		|| check_for_opt_lnum_arg(argvars, 2) == FAIL))
+	return;
+
     buf = tv_get_buf(&argvars[0], FALSE);
     if (buf == NULL)
     {
@@ -727,6 +739,12 @@ f_getbufline(typval_T *argvars, typval_T *rettv)
     linenr_T	end = 1;
     buf_T	*buf;
 
+    if (in_vim9script()
+	    && (check_for_buffer_arg(argvars, 0) == FAIL
+		|| check_for_lnum_arg(argvars, 1) == FAIL
+		|| check_for_opt_lnum_arg(argvars, 2) == FAIL))
+	return;
+
     buf = tv_get_buf_from_arg(&argvars[0]);
     if (buf != NULL)
     {

src/evalvars.c

@@ -4039,6 +4039,11 @@ f_gettabvar(typval_T *argvars, typval_T *rettv)
     rettv->v_type = VAR_STRING;
     rettv->vval.v_string = NULL;
 
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL))
+	return;
+
     varname = tv_get_string_chk(&argvars[1]);
     tp = find_tabpage((int)tv_get_number_chk(&argvars[0], NULL));
     if (tp != NULL && varname != NULL)
@@ -4073,6 +4078,12 @@ f_gettabvar(typval_T *argvars, typval_T *rettv)
     void
 f_gettabwinvar(typval_T *argvars, typval_T *rettv)
 {
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_string_arg(argvars, 2) == FAIL))
+	return;
+
     getwinvar(argvars, rettv, 1);
 }
 
@@ -4082,6 +4093,11 @@ f_gettabwinvar(typval_T *argvars, typval_T *rettv)
     void
 f_getwinvar(typval_T *argvars, typval_T *rettv)
 {
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL))
+	return;
+
     getwinvar(argvars, rettv, 0);
 }
 
@@ -4165,6 +4181,11 @@ f_settabvar(typval_T *argvars, typval_T *rettv UNUSED)
     if (check_secure())
 	return;
 
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL))
+	return;
+
     tp = find_tabpage((int)tv_get_number_chk(&argvars[0], NULL));
     varname = tv_get_string_chk(&argvars[1]);
     varp = &argvars[2];
@@ -4195,6 +4216,12 @@ f_settabvar(typval_T *argvars, typval_T *rettv UNUSED)
     void
 f_settabwinvar(typval_T *argvars, typval_T *rettv UNUSED)
 {
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_string_arg(argvars, 2) == FAIL))
+	return;
+
     setwinvar(argvars, 1);
 }
 
@@ -4204,6 +4231,11 @@ f_settabwinvar(typval_T *argvars, typval_T *rettv UNUSED)
     void
 f_setwinvar(typval_T *argvars, typval_T *rettv UNUSED)
 {
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL))
+	return;
+
     setwinvar(argvars, 0);
 }
 

src/evalwindow.c

@@ -655,8 +655,7 @@ f_tabpagewinnr(typval_T *argvars UNUSED, typval_T *rettv)
 
     if (in_vim9script()
 	    && (check_for_number_arg(argvars, 0) == FAIL
-		|| (argvars[1].v_type != VAR_UNKNOWN
+		|| check_for_opt_string_arg(argvars, 1) == FAIL))
-		    && check_for_string_arg(argvars, 1) == FAIL)))
 	return;
 
     tp = find_tabpage((int)tv_get_number(&argvars[0]));
@@ -834,6 +833,12 @@ f_win_splitmove(typval_T *argvars, typval_T *rettv)
     win_T   *targetwin;
     int     flags = 0, size = 0;
 
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_opt_dict_arg(argvars, 2) == FAIL))
+	return;
+
     wp = find_win_by_nr_or_id(&argvars[0]);
     targetwin = find_win_by_nr_or_id(&argvars[1]);
 

src/filepath.c

@@ -1254,6 +1254,15 @@ f_glob(typval_T *argvars, typval_T *rettv)
     expand_T	xpc;
     int		error = FALSE;
 
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_opt_bool_arg(argvars, 1) == FAIL
+		|| (argvars[1].v_type != VAR_UNKNOWN
+		    && (check_for_opt_bool_arg(argvars, 2) == FAIL
+			|| (argvars[2].v_type != VAR_UNKNOWN
+			    && check_for_opt_bool_arg(argvars, 3) == FAIL)))))
+	return;
+
     // When the optional second argument is non-zero, don't remove matches
     // for 'wildignore' and don't put matches for 'suffixes' at the end.
     rettv->v_type = VAR_STRING;
@@ -1318,11 +1327,23 @@ f_globpath(typval_T *argvars, typval_T *rettv)
 {
     int		flags = WILD_IGNORE_COMPLETESLASH;
     char_u	buf1[NUMBUFLEN];
-    char_u	*file = tv_get_string_buf_chk(&argvars[1], buf1);
+    char_u	*file;
     int		error = FALSE;
     garray_T	ga;
     int		i;
 
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL
+		|| check_for_opt_bool_arg(argvars, 2) == FAIL
+		|| (argvars[2].v_type != VAR_UNKNOWN
+		    && (check_for_opt_bool_arg(argvars, 3) == FAIL
+			|| (argvars[3].v_type != VAR_UNKNOWN
+			    && check_for_opt_bool_arg(argvars, 4) == FAIL)))))
+	return;
+
+    file = tv_get_string_buf_chk(&argvars[1], buf1);
+
     // When the optional second argument is non-zero, don't remove matches
     // for 'wildignore' and don't put matches for 'suffixes' at the end.
     rettv->v_type = VAR_STRING;
@@ -1449,8 +1470,7 @@ f_pathshorten(typval_T *argvars, typval_T *rettv)
 
     if (in_vim9script()
 	    && (check_for_string_arg(argvars, 0) == FAIL
-		|| (argvars[1].v_type != VAR_UNKNOWN
+		|| check_for_opt_number_arg(argvars, 1) == FAIL))
-		    && check_for_number_arg(argvars, 1) == FAIL)))
 	return;
 
     if (argvars[1].v_type != VAR_UNKNOWN)
@@ -2423,10 +2443,12 @@ f_browse(typval_T *argvars UNUSED, typval_T *rettv)
     int		error = FALSE;
 
     if (in_vim9script()
-	    && (check_for_string_arg(argvars, 1) == FAIL
+	    && (check_for_bool_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL
 		|| check_for_string_arg(argvars, 2) == FAIL
 		|| check_for_string_arg(argvars, 3) == FAIL))
 	return;
+
     save = (int)tv_get_number_chk(&argvars[0], &error);
     title = tv_get_string_chk(&argvars[1]);
     initdir = tv_get_string_buf_chk(&argvars[2], buf);

src/globals.h

@@ -1700,10 +1700,11 @@ EXTERN char e_readonlyvar[]	INIT(= N_("E46: Cannot change read-only variable \"%
 EXTERN char e_readonlysbx[]	INIT(= N_("E794: Cannot set variable in the sandbox: \"%s\""));
 EXTERN char e_stringreq[]	INIT(= N_("E928: String required"));
 EXTERN char e_numberreq[]	INIT(= N_("E889: Number required"));
-EXTERN char e_boolreq[]		INIT(= N_("E839: Number required"));
+EXTERN char e_boolreq[]		INIT(= N_("E839: Bool required"));
 EXTERN char e_emptykey[]	INIT(= N_("E713: Cannot use empty key for Dictionary"));
 EXTERN char e_dictreq[]		INIT(= N_("E715: Dictionary required"));
 EXTERN char e_listidx[]		INIT(= N_("E684: list index out of range: %ld"));
+EXTERN char e_blobreq[]		INIT(= N_("E538: Dictionary required"));
 EXTERN char e_blobidx[]		INIT(= N_("E979: Blob index out of range: %ld"));
 EXTERN char e_invalblob[]	INIT(= N_("E978: Invalid operation for Blob"));
 EXTERN char e_toomanyarg[]	INIT(= N_("E118: Too many arguments for function: %s"));
@@ -1810,6 +1811,8 @@ EXTERN char e_lock_unlock[]	INIT(= N_("E940: Cannot lock or unlock variable %s")
 #if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
 EXTERN char e_alloc_color[]	INIT(= N_("E254: Cannot allocate color %s"));
 #endif
+EXTERN char e_chan_or_job_req[]	INIT(= N_("E706: Channel or Job required"));
+EXTERN char e_jobreq[]		INIT(= N_("E693: Job required"));
 
 EXTERN char top_bot_msg[] INIT(= N_("search hit TOP, continuing at BOTTOM"));
 EXTERN char bot_top_msg[] INIT(= N_("search hit BOTTOM, continuing at TOP"));

src/insexpand.c

@@ -2436,6 +2436,11 @@ f_complete(typval_T *argvars, typval_T *rettv UNUSED)
     int	    startcol;
     int	    save_textlock = textlock;
 
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_list_arg(argvars, 1) == FAIL))
+	return;
+
     if ((State & INSERT) == 0)
     {
 	emsg(_("E785: complete() can only be used in Insert mode"));
@@ -2468,6 +2473,12 @@ f_complete(typval_T *argvars, typval_T *rettv UNUSED)
     void
 f_complete_add(typval_T *argvars, typval_T *rettv)
 {
+    if (in_vim9script()
+	    && (argvars[0].v_type != VAR_DICT
+		&& argvars[0].v_type != VAR_STRING
+		&& check_for_string_arg(argvars, 0) == FAIL))
+	return;
+
     rettv->vval.v_number = ins_compl_add_tv(&argvars[0], 0, FALSE);
 }
 

src/job.c

@@ -1726,9 +1726,7 @@ f_prompt_setprompt(typval_T *argvars, typval_T *rettv UNUSED)
     char_u	*text;
 
     if (in_vim9script()
-	    && ((argvars[0].v_type != VAR_STRING
+	    && (check_for_string_or_number_arg(argvars, 0) == FAIL
-		    && argvars[0].v_type != VAR_NUMBER
-		    && check_for_string_arg(argvars, 0) == FAIL)
 		|| check_for_string_arg(argvars, 1) == FAIL))
 	return;
 
@@ -1875,9 +1873,15 @@ f_job_info(typval_T *argvars, typval_T *rettv)
     void
 f_job_setoptions(typval_T *argvars, typval_T *rettv UNUSED)
 {
-    job_T	*job = get_job_arg(&argvars[0]);
+    job_T	*job;
     jobopt_T	opt;
 
+    if (in_vim9script()
+	    && (check_for_job_arg(argvars, 0) == FAIL
+		|| check_for_dict_arg(argvars, 1) == FAIL))
+	return;
+
+    job = get_job_arg(&argvars[0]);
     if (job == NULL)
 	return;
     clear_job_options(&opt);
@@ -1928,8 +1932,14 @@ f_job_status(typval_T *argvars, typval_T *rettv)
     void
 f_job_stop(typval_T *argvars, typval_T *rettv)
 {
-    job_T	*job = get_job_arg(&argvars[0]);
+    job_T	*job;
 
+    if (in_vim9script()
+	    && (check_for_job_arg(argvars, 0) == FAIL
+		|| check_for_opt_string_or_number_arg(argvars, 1) == FAIL))
+	return;
+
+    job = get_job_arg(&argvars[0]);
     if (job != NULL)
 	rettv->vval.v_number = job_stop(job, argvars, NULL);
 }

src/list.c

@@ -823,6 +823,11 @@ flatten_common(typval_T *argvars, typval_T *rettv, int make_copy)
     long    maxdepth;
     int	    error = FALSE;
 
+    if (in_vim9script()
+	    && (check_for_list_arg(argvars, 0) == FAIL
+		|| check_for_opt_number_arg(argvars, 1) == FAIL))
+	return;
+
     if (argvars[0].v_type != VAR_LIST)
     {
 	semsg(_(e_listarg), "flatten()");
@@ -1267,6 +1272,11 @@ f_join(typval_T *argvars, typval_T *rettv)
     garray_T	ga;
     char_u	*sep;
 
+    if (in_vim9script()
+	    && (check_for_list_arg(argvars, 0) == FAIL
+		|| check_for_opt_string_arg(argvars, 1) == FAIL))
+	return;
+
     if (argvars[0].v_type != VAR_LIST)
     {
 	emsg(_(e_listreq));
@@ -1470,6 +1480,12 @@ f_list2str(typval_T *argvars, typval_T *rettv)
 
     rettv->v_type = VAR_STRING;
     rettv->vval.v_string = NULL;
+
+    if (in_vim9script()
+	    && (check_for_list_arg(argvars, 0) == FAIL
+		|| check_for_opt_bool_arg(argvars, 1) == FAIL))
+	return;
+
     if (argvars[0].v_type != VAR_LIST)
     {
 	emsg(_(e_invarg));
@@ -1522,6 +1538,12 @@ list_remove(typval_T *argvars, typval_T *rettv, char_u *arg_errmsg)
     int		error = FALSE;
     long	idx;
 
+    if (in_vim9script()
+	    && (check_for_list_arg(argvars, 0) == FAIL
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_opt_number_arg(argvars, 2) == FAIL))
+	return;
+
     if ((l = argvars[0].vval.v_list) == NULL
 			     || value_check_lock(l->lv_lock, arg_errmsg, TRUE))
 	return;
@@ -2489,6 +2511,16 @@ f_count(typval_T *argvars, typval_T *rettv)
     int		ic = FALSE;
     int		error = FALSE;
 
+    if (in_vim9script()
+	    && ((argvars[0].v_type != VAR_STRING
+		    && argvars[0].v_type != VAR_LIST
+		    && argvars[0].v_type != VAR_DICT
+		    && check_for_string_arg(argvars, 0) == FAIL)
+		|| check_for_opt_bool_arg(argvars, 2) == FAIL
+		|| (argvars[2].v_type != VAR_UNKNOWN
+		    && check_for_opt_number_arg(argvars, 3) == FAIL)))
+	return;
+
     if (argvars[2].v_type != VAR_UNKNOWN)
 	ic = (int)tv_get_bool_chk(&argvars[2], &error);
 

src/map.c

@@ -2316,6 +2316,12 @@ f_mapset(typval_T *argvars, typval_T *rettv UNUSED)
     int		nowait;
     char_u	*arg;
 
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_bool_arg(argvars, 1) == FAIL
+		|| check_for_dict_arg(argvars, 2) == FAIL))
+	return;
+
     which = tv_get_string_buf_chk(&argvars[0], buf);
     if (which == NULL)
 	return;

src/match.c

@@ -1045,14 +1045,21 @@ f_setmatches(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
     listitem_T	*li;
     dict_T	*d;
     list_T	*s = NULL;
-    win_T	*win = get_optional_window(argvars, 1);
+    win_T	*win;
 
     rettv->vval.v_number = -1;
+
+    if (in_vim9script()
+	    && (check_for_list_arg(argvars, 0) == FAIL
+		|| check_for_opt_number_arg(argvars, 1) == FAIL))
+	return;
+
     if (argvars[0].v_type != VAR_LIST)
     {
 	emsg(_(e_listreq));
 	return;
     }
+    win = get_optional_window(argvars, 1);
     if (win == NULL)
 	return;
 

src/proto/typval.pro

@@ -11,10 +11,24 @@ varnumber_T tv_get_bool_chk(typval_T *varp, int *denote);
 float_T tv_get_float(typval_T *varp);
 int check_for_string_arg(typval_T *args, int idx);
 int check_for_nonempty_string_arg(typval_T *args, int idx);
+int check_for_opt_string_arg(typval_T *args, int idx);
 int check_for_number_arg(typval_T *args, int idx);
+int check_for_opt_number_arg(typval_T *args, int idx);
 int check_for_bool_arg(typval_T *args, int idx);
+int check_for_opt_bool_arg(typval_T *args, int idx);
 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_opt_dict_arg(typval_T *args, int idx);
+int check_for_blob_arg(typval_T *args, int idx);
+int check_for_chan_or_job_arg(typval_T *args, int idx);
+int check_for_job_arg(typval_T *args, int idx);
+int check_for_string_or_number_arg(typval_T *args, int idx);
+int check_for_buffer_arg(typval_T *args, int idx);
+int check_for_lnum_arg(typval_T *args, int idx);
+int check_for_opt_lnum_arg(typval_T *args, int idx);
+int check_for_opt_string_or_number_arg(typval_T *args, int idx);
+int check_for_string_or_blob_arg(typval_T *args, int idx);
 char_u *tv_get_string(typval_T *varp);
 char_u *tv_get_string_strict(typval_T *varp);
 char_u *tv_get_string_buf(typval_T *varp, char_u *buf);

src/quickfix.c

@@ -8466,6 +8466,14 @@ f_setloclist(typval_T *argvars, typval_T *rettv)
 
     rettv->vval.v_number = -1;
 
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_list_arg(argvars, 1) == FAIL
+		|| check_for_opt_string_arg(argvars, 2) == FAIL
+		|| (argvars[2].v_type != VAR_UNKNOWN
+		    && check_for_opt_dict_arg(argvars, 3) == FAIL)))
+	return;
+
     win = find_win_by_nr_or_id(&argvars[0]);
     if (win != NULL)
 	set_qf_ll_list(win, &argvars[1], &argvars[2], &argvars[3], rettv);
@@ -8477,6 +8485,13 @@ f_setloclist(typval_T *argvars, typval_T *rettv)
     void
 f_setqflist(typval_T *argvars, typval_T *rettv)
 {
+    if (in_vim9script()
+	    && (check_for_list_arg(argvars, 0) == FAIL
+		|| check_for_opt_string_arg(argvars, 1) == FAIL
+		|| (argvars[1].v_type != VAR_UNKNOWN
+		    && check_for_opt_dict_arg(argvars, 2) == FAIL)))
+	return;
+
     set_qf_ll_list(NULL, &argvars[0], &argvars[1], &argvars[2], rettv);
 }
 #endif

src/search.c

@@ -1217,7 +1217,8 @@ first_submatch(regmmatch_T *rp)
 do_search(
     oparg_T	    *oap,	// can be NULL
     int		    dirc,	// '/' or '?'
-    int		    search_delim, // the delimiter for the search, e.g. '%' in s%regex%replacement%
+    int		    search_delim, // the delimiter for the search, e.g. '%' in
+				  // s%regex%replacement%
     char_u	    *pat,
     long	    count,
     int		    options,
@@ -1476,11 +1477,11 @@ do_search(
 			msgbuf = trunc;
 		    }
 
-    #ifdef FEAT_RIGHTLEFT
+#ifdef FEAT_RIGHTLEFT
-		    // The search pattern could be shown on the right in rightleft
+		    // The search pattern could be shown on the right in
-		    // mode, but the 'ruler' and 'showcmd' area use it too, thus
+		    // rightleft mode, but the 'ruler' and 'showcmd' area use
-		    // it would be blanked out again very soon.  Show it on the
+		    // it too, thus it would be blanked out again very soon.
-		    // left, but do reverse the text.
+		    // Show it on the left, but do reverse the text.
 		    if (curwin->w_p_rl && *curwin->w_p_rlc == 's')
 		    {
 			char_u *r;
@@ -1503,7 +1504,7 @@ do_search(
 				vim_memset(msgbuf + pat_len, ' ', r - msgbuf);
 			}
 		    }
-    #endif
+#endif
 		    msg_outtrans(msgbuf);
 		    msg_clr_eos();
 		    msg_check();
@@ -1548,6 +1549,9 @@ do_search(
 	    }
 	}
 
+	/*
+	 * The actual search.
+	 */
 	c = searchit(curwin, curbuf, &pos, NULL,
 					      dirc == '/' ? FORWARD : BACKWARD,
 		searchstr, count, spats[0].off.end + (options &
@@ -1557,7 +1561,7 @@ do_search(
 		RE_LAST, sia);
 
 	if (dircp != NULL)
-	    *dircp = search_delim;	// restore second '/' or '?' for normal_cmd()
+	    *dircp = search_delim; // restore second '/' or '?' for normal_cmd()
 
 	if (!shortmess(SHM_SEARCH)
 		&& ((dirc == '/' && LT_POS(pos, curwin->w_cursor))
@@ -4794,6 +4798,12 @@ do_fuzzymatch(typval_T *argvars, typval_T *rettv, int retmatchpos)
     int		ret;
     int		matchseq = FALSE;
 
+    if (in_vim9script()
+	    && (check_for_list_arg(argvars, 0) == FAIL
+		|| check_for_string_arg(argvars, 1) == FAIL
+		|| check_for_opt_dict_arg(argvars, 2) == FAIL))
+	return;
+
     CLEAR_POINTER(&cb);
 
     // validate and get the arguments

src/sign.c

@@ -2300,6 +2300,12 @@ f_sign_getplaced(typval_T *argvars, typval_T *rettv)
     if (rettv_list_alloc_id(rettv, aid_sign_getplaced) != OK)
 	return;
 
+    if (in_vim9script()
+	    && (check_for_opt_string_or_number_arg(argvars, 0) == FAIL
+		|| (argvars[0].v_type != VAR_UNKNOWN
+		    && check_for_opt_dict_arg(argvars, 1) == FAIL)))
+	return;
+
     if (argvars[0].v_type != VAR_UNKNOWN)
     {
 	// get signs placed in the specified buffer

src/strings.c

@@ -904,8 +904,7 @@ f_str2list(typval_T *argvars, typval_T *rettv)
 
     if (in_vim9script()
 	    && (check_for_string_arg(argvars, 0) == FAIL
-		|| (argvars[1].v_type != VAR_UNKNOWN
+		|| check_for_opt_bool_arg(argvars, 1) == FAIL))
-		    && check_for_bool_arg(argvars, 1) == FAIL)))
 	return;
 
     if (argvars[1].v_type != VAR_UNKNOWN)
@@ -1116,8 +1115,7 @@ f_strchars(typval_T *argvars, typval_T *rettv)
 
     if (in_vim9script()
 	    && (check_for_string_arg(argvars, 0) == FAIL
-		|| (argvars[1].v_type != VAR_UNKNOWN
+		|| check_for_opt_bool_arg(argvars, 1) == FAIL))
-		    && check_for_bool_arg(argvars, 1) == FAIL)))
 	return;
 
     if (argvars[1].v_type != VAR_UNKNOWN)
@@ -1141,8 +1139,7 @@ f_strdisplaywidth(typval_T *argvars, typval_T *rettv)
 
     if (in_vim9script()
 	    && (check_for_string_arg(argvars, 0) == FAIL
-		|| (argvars[1].v_type != VAR_UNKNOWN
+		|| check_for_opt_number_arg(argvars, 1) == FAIL))
-		    && check_for_number_arg(argvars, 1) == FAIL)))
 	return;
 
     s = tv_get_string(&argvars[0]);
@@ -1178,6 +1175,14 @@ f_strcharpart(typval_T *argvars, typval_T *rettv)
     int		slen;
     int		error = FALSE;
 
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_opt_number_arg(argvars, 2) == FAIL
+		|| (argvars[2].v_type != VAR_UNKNOWN
+		    && check_for_opt_bool_arg(argvars, 3) == FAIL)))
+	return;
+
     p = tv_get_string(&argvars[0]);
     slen = (int)STRLEN(p);
 
@@ -1261,6 +1266,14 @@ f_strpart(typval_T *argvars, typval_T *rettv)
     int		slen;
     int		error = FALSE;
 
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_opt_number_arg(argvars, 2) == FAIL
+		|| (argvars[2].v_type != VAR_UNKNOWN
+		    && check_for_opt_bool_arg(argvars, 3) == FAIL)))
+	return;
+
     p = tv_get_string(&argvars[0]);
     slen = (int)STRLEN(p);
 

src/terminal.c

@@ -5928,11 +5928,17 @@ f_term_gettitle(typval_T *argvars, typval_T *rettv)
     void
 f_term_gettty(typval_T *argvars, typval_T *rettv)
 {
-    buf_T	*buf = term_get_buf(argvars, "term_gettty()");
+    buf_T	*buf;
     char_u	*p = NULL;
     int		num = 0;
 
+    if (in_vim9script()
+	    && (check_for_string_or_number_arg(argvars, 0) == FAIL
+		|| check_for_opt_bool_arg(argvars, 1) == FAIL))
+	return;
+
     rettv->v_type = VAR_STRING;
+    buf = term_get_buf(argvars, "term_gettty()");
     if (buf == NULL)
 	return;
     if (argvars[1].v_type != VAR_UNKNOWN)
@@ -6098,9 +6104,7 @@ f_term_sendkeys(typval_T *argvars, typval_T *rettv UNUSED)
     term_T	*term;
 
     if (in_vim9script()
-	    && ((argvars[0].v_type != VAR_STRING
+	    && (check_for_string_or_number_arg(argvars, 0) == FAIL
-		    && argvars[0].v_type != VAR_NUMBER
-		    && check_for_string_arg(argvars, 0) == FAIL)
 		|| check_for_string_arg(argvars, 1) == FAIL))
 	return;
 
@@ -6175,9 +6179,16 @@ f_term_getansicolors(typval_T *argvars, typval_T *rettv)
     void
 f_term_setansicolors(typval_T *argvars, typval_T *rettv UNUSED)
 {
-    buf_T	*buf = term_get_buf(argvars, "term_setansicolors()");
+    buf_T	*buf;
     term_T	*term;
 
+    if (in_vim9script()
+	    && (check_for_opt_string_or_number_arg(argvars, 0) == FAIL
+		|| (argvars[0].v_type != VAR_UNKNOWN
+		    && check_for_opt_list_arg(argvars, 1) == FAIL)))
+	return;
+
+    buf = term_get_buf(argvars, "term_setansicolors()");
     if (buf == NULL)
 	return;
     term = buf->b_term;
@@ -6206,9 +6217,7 @@ f_term_setapi(typval_T *argvars, typval_T *rettv UNUSED)
     char_u	*api;
 
     if (in_vim9script()
-	    && ((argvars[0].v_type != VAR_STRING
+	    && (check_for_string_or_number_arg(argvars, 0) == FAIL
-		    && argvars[0].v_type != VAR_NUMBER
-		    && check_for_string_arg(argvars, 0) == FAIL)
 		|| check_for_string_arg(argvars, 1) == FAIL))
 	return;
 
@@ -6236,9 +6245,7 @@ f_term_setrestore(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
     char_u	*cmd;
 
     if (in_vim9script()
-	    && ((argvars[0].v_type != VAR_STRING
+	    && (check_for_string_or_number_arg(argvars, 0) == FAIL
-		    && argvars[0].v_type != VAR_NUMBER
-		    && check_for_string_arg(argvars, 0) == FAIL)
 		|| check_for_string_arg(argvars, 1) == FAIL))
 	return;
 
@@ -6266,9 +6273,7 @@ f_term_setkill(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
     char_u	*how;
 
     if (in_vim9script()
-	    && ((argvars[0].v_type != VAR_STRING
+	    && (check_for_string_or_number_arg(argvars, 0) == FAIL
-		    && argvars[0].v_type != VAR_NUMBER
-		    && check_for_string_arg(argvars, 0) == FAIL)
 		|| check_for_string_arg(argvars, 1) == FAIL))
 	return;
 
@@ -6321,11 +6326,8 @@ f_term_wait(typval_T *argvars, typval_T *rettv UNUSED)
     buf_T	*buf;
 
     if (in_vim9script()
-	    && ((argvars[0].v_type != VAR_STRING
+	    && (check_for_string_or_number_arg(argvars, 0) == FAIL
-		    && argvars[0].v_type != VAR_NUMBER
+		|| check_for_opt_number_arg(argvars, 1) == FAIL))
-		    && check_for_string_arg(argvars, 0) == FAIL) ||
-		(argvars[1].v_type != VAR_UNKNOWN
-		 && check_for_number_arg(argvars, 1) == FAIL)))
 	return;
 
     buf = term_get_buf(argvars, "term_wait()");

src/testdir/test_blob.vim

@@ -423,24 +423,6 @@ func Test_blob_func_remove()
   END
   call CheckLegacyAndVim9Failure(lines, 'E979:')
 
-  let lines =<< trim END
-      VAR b = 0zDEADBEEF
-      call remove(1, 0)
-  END
-  call CheckLegacyAndVim9Failure(lines, 'E896:')
-
-  let lines =<< trim END
-      VAR b = 0zDEADBEEF
-      call remove(b, b)
-  END
-  call CheckLegacyAndVim9Failure(lines, 'E974:')
-
-  let lines =<< trim END
-      VAR b = 0zDEADBEEF
-      call remove(b, 1, [])
-  END
-  call CheckLegacyAndVim9Failure(lines, 'E745:')
-
   let lines =<< trim END
       VAR b = 0zDEADBEEF
       call remove(test_null_blob(), 1, 2)
@@ -504,16 +486,6 @@ func Test_blob_index()
       call assert_equal(-1, index(test_null_blob(), 1))
   END
   call CheckLegacyAndVim9Success(lines)
-
-  let lines =<< trim END
-      echo index(0z11110111, 0x11, [])
-  END
-  call CheckLegacyAndVim9Failure(lines, 'E745:')
-
-  let lines =<< trim END
-      call index("asdf", 0)
-  END
-  call CheckLegacyAndVim9Failure(lines, 'E897:')
 endfunc
 
 func Test_blob_insert()

src/testdir/test_gui.vim

@@ -1093,11 +1093,11 @@ func Test_gui_mouse_event()
   let &guioptions = save_guioptions
 
   " Test invalid parameters for test_gui_mouse_event()
-  call assert_fails('call test_gui_mouse_event("", 1, 2, 3, 4)', 'E474:')
+  call assert_fails('call test_gui_mouse_event("", 1, 2, 3, 4)', 'E1210:')
-  call assert_fails('call test_gui_mouse_event(0, "", 2, 3, 4)', 'E474:')
+  call assert_fails('call test_gui_mouse_event(0, "", 2, 3, 4)', 'E1210:')
-  call assert_fails('call test_gui_mouse_event(0, 1, "", 3, 4)', 'E474:')
+  call assert_fails('call test_gui_mouse_event(0, 1, "", 3, 4)', 'E1210:')
-  call assert_fails('call test_gui_mouse_event(0, 1, 2, "", 4)', 'E474:')
+  call assert_fails('call test_gui_mouse_event(0, 1, 2, "", 4)', 'E1210:')
-  call assert_fails('call test_gui_mouse_event(0, 1, 2, 3, "")', 'E474:')
+  call assert_fails('call test_gui_mouse_event(0, 1, 2, 3, "")', 'E1210:')
 
   bw!
   call test_override('no_query_mouse', 0)

src/testdir/test_vim9_builtin.vim

@@ -270,18 +270,10 @@ enddef
 def Test_browse()
   CheckFeature browse
 
-  var lines =<< trim END
+  CheckDefAndScriptFailure2(['browse(2, "title", "dir", "file")'], 'E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1')
-      browse(1, 2, 3, 4)
+  CheckDefAndScriptFailure2(['browse(true, 2, "dir", "file")'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
-  END
+  CheckDefAndScriptFailure2(['browse(true, "title", 3, "file")'], 'E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3')
-  CheckDefExecAndScriptFailure(lines, 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['browse(true, "title", "dir", 4)'], 'E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4')
-  lines =<< trim END
-      browse(1, 'title', 3, 4)
-  END
-  CheckDefExecAndScriptFailure(lines, 'E1174: String required for argument 3')
-  lines =<< trim END
-      browse(1, 'title', 'dir', 4)
-  END
-  CheckDefExecAndScriptFailure(lines, 'E1174: String required for argument 4')
 enddef
 
 def Test_browsedir()
@@ -330,6 +322,8 @@ def Test_bufnr()
   buf = bufnr('Xdummy', true)
   buf->assert_notequal(-1)
   exe 'bwipe! ' .. buf
+  CheckDefAndScriptFailure2(['bufnr([1])'], 'E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['bufnr(1, 2)'], 'E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2')
 enddef
 
 def Test_bufwinid()
@@ -379,22 +373,53 @@ enddef
 def Test_ch_canread()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefFailure(['ch_canread(10)'], 'E1013: Argument 1: type mismatch, expected channel but got number')
   endif
-  CheckDefFailure(['ch_canread(10)'], 'E1013: Argument 1: type mismatch, expected channel but got number')
 enddef
 
 def Test_ch_close()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefFailure(['ch_close("c")'], 'E1013: Argument 1: type mismatch, expected channel but got string')
   endif
-  CheckDefFailure(['ch_close("c")'], 'E1013: Argument 1: type mismatch, expected channel but got string')
 enddef
 
 def Test_ch_close_in()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefFailure(['ch_close_in(true)'], 'E1013: Argument 1: type mismatch, expected channel but got bool')
+  endif
+enddef
+
+def Test_ch_evalexpr()
+  if !has('channel')
+    CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_evalexpr(1, "a")'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E1218: Channel or Job required for argument 1')
+    CheckDefAndScriptFailure2(['ch_evalexpr(test_null_channel(), 1, [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
+  endif
+enddef
+
+def Test_ch_evalraw()
+  if !has('channel')
+    CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_evalraw(1, "")'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E1218: Channel or Job required for argument 1')
+    CheckDefAndScriptFailure2(['ch_evalraw(test_null_channel(), 1)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+    CheckDefAndScriptFailure2(['ch_evalraw(test_null_channel(), "", [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
+  endif
+enddef
+
+def Test_ch_getbufnr()
+  if !has('channel')
+    CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_getbufnr(1, "a")'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E1218: Channel or Job required for argument 1')
+    CheckDefAndScriptFailure2(['ch_getbufnr(test_null_channel(), 1)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
   endif
-  CheckDefFailure(['ch_close_in(true)'], 'E1013: Argument 1: type mismatch, expected channel but got bool')
 enddef
 
 def Test_ch_getjob()
@@ -410,67 +435,94 @@ enddef
 def Test_ch_info()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefFailure(['ch_info([1])'], 'E1013: Argument 1: type mismatch, expected channel but got list<number>')
   endif
-  CheckDefFailure(['ch_info([1])'], 'E1013: Argument 1: type mismatch, expected channel but got list<number>')
 enddef
 
 def Test_ch_logfile()
   if !has('channel')
     CheckFeature channel
-  endif
+  else
-  assert_fails('ch_logfile(true)', 'E1174:')
+    assert_fails('ch_logfile(true)', 'E1174:')
-  assert_fails('ch_logfile("foo", true)', 'E1174:')
+    assert_fails('ch_logfile("foo", true)', 'E1174:')
 
-  CheckDefAndScriptFailure2(['ch_logfile(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+    CheckDefAndScriptFailure2(['ch_logfile(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
-  CheckDefAndScriptFailure2(['ch_logfile("a", true)'], 'E1013: Argument 2: type mismatch, expected string but got bool', 'E1174: String required for argument 2')
+    CheckDefAndScriptFailure2(['ch_logfile("a", true)'], 'E1013: Argument 2: type mismatch, expected string but got bool', 'E1174: String required for argument 2')
+  endif
 enddef
 
 def Test_ch_open()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_open({"a": 10}, "a")'], 'E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1')
+    CheckDefAndScriptFailure2(['ch_open("a", [1])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2')
   endif
-  CheckDefAndScriptFailure2(['ch_open({"a": 10}, "a")'], 'E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1')
-  CheckDefAndScriptFailure2(['ch_open("a", [1])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2')
 enddef
 
 def Test_ch_read()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_read(1)'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
+    CheckDefAndScriptFailure2(['ch_read(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E715: Dictionary required')
   endif
-  CheckDefAndScriptFailure2(['ch_read(1)'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
-  CheckDefAndScriptFailure2(['ch_read(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E715: Dictionary required')
 enddef
 
 def Test_ch_readblob()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_readblob(1)'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
+    CheckDefAndScriptFailure2(['ch_readblob(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E715: Dictionary required')
   endif
-  CheckDefAndScriptFailure2(['ch_readblob(1)'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
-  CheckDefAndScriptFailure2(['ch_readblob(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E715: Dictionary required')
 enddef
 
 def Test_ch_readraw()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_readraw(1)'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
+    CheckDefAndScriptFailure2(['ch_readraw(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E715: Dictionary required')
+  endif
+enddef
+
+def Test_ch_sendexpr()
+  if !has('channel')
+    CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_sendexpr(1, "a")'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E1218: Channel or Job required for argument 1')
+    CheckDefAndScriptFailure2(['ch_sendexpr(test_null_channel(), 1, [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
+  endif
+enddef
+
+def Test_ch_sendraw()
+  if !has('channel')
+    CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_sendraw(1, "")'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E1218: Channel or Job required for argument 1')
+    CheckDefAndScriptFailure2(['ch_sendraw(test_null_channel(), 1)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+    CheckDefAndScriptFailure2(['ch_sendraw(test_null_channel(), "", [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
   endif
-  CheckDefAndScriptFailure2(['ch_readraw(1)'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
-  CheckDefAndScriptFailure2(['ch_readraw(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E715: Dictionary required')
 enddef
 
 def Test_ch_setoptions()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_setoptions(1, {})'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
+    CheckDefFailure(['ch_setoptions(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>')
   endif
-  CheckDefAndScriptFailure2(['ch_setoptions(1, {})'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
-  CheckDefFailure(['ch_setoptions(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>')
 enddef
 
 def Test_ch_status()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['ch_status(1)'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
+    CheckDefAndScriptFailure2(['ch_status(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E715: Dictionary required')
   endif
-  CheckDefAndScriptFailure2(['ch_status(1)'], 'E1013: Argument 1: type mismatch, expected channel but got number', 'E475: Invalid argument')
-  CheckDefAndScriptFailure2(['ch_status(test_null_channel(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E715: Dictionary required')
 enddef
 
 def Test_char2nr()
@@ -538,6 +590,15 @@ def Test_col()
   bw!
 enddef
 
+def Test_complete()
+  CheckDefAndScriptFailure2(['complete("1", [])'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['complete(1, {})'], 'E1013: Argument 2: type mismatch, expected list<any> but got dict<unknown>', 'E1211: List required for argument 2')
+enddef
+
+def Test_complete_add()
+  CheckDefAndScriptFailure2(['complete_add([])'], 'E1013: Argument 1: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 1')
+enddef
+
 def Test_complete_info()
   CheckDefFailure(['complete_info("")'], 'E1013: Argument 1: type mismatch, expected list<string> but got string')
   CheckDefFailure(['complete_info({})'], 'E1013: Argument 1: type mismatch, expected list<string> but got dict<unknown>')
@@ -576,6 +637,12 @@ enddef
 def Test_count()
   count('ABC ABC ABC', 'b', true)->assert_equal(3)
   count('ABC ABC ABC', 'b', false)->assert_equal(0)
+  CheckDefAndScriptFailure2(['count(10, 1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['count("a", [1], 2)'], 'E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3')
+  CheckDefAndScriptFailure2(['count("a", [1], 0, "b")'], 'E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4')
+  count([1, 2, 2, 3], 2)->assert_equal(2)
+  count([1, 2, 2, 3], 2, false, 2)->assert_equal(1)
+  count({a: 1.1, b: 2.2, c: 1.1}, 1.1)->assert_equal(2)
 enddef
 
 def Test_cursor()
@@ -590,6 +657,9 @@ def Test_cursor()
     cursor('2', 1)
   END
   CheckDefExecAndScriptFailure(lines, 'E1209:')
+  CheckDefAndScriptFailure2(['cursor(0z10, 1)'], 'E1013: Argument 1: type mismatch, expected number but got blob', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['cursor(1, "2")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['cursor(1, 2, "3")'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
 enddef
 
 def Test_debugbreak()
@@ -597,6 +667,10 @@ def Test_debugbreak()
   CheckDefFailure(['debugbreak("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
 enddef
 
+def Test_deepcopy()
+  CheckDefAndScriptFailure2(['deepcopy({}, 2)'], 'E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2')
+enddef
+
 def Test_delete()
   var res: bool = delete('doesnotexist')
   assert_equal(true, res)
@@ -605,6 +679,12 @@ def Test_delete()
   CheckDefFailure(['delete("a", 10)'], 'E1013: Argument 2: type mismatch, expected string but got number')
 enddef
 
+def Test_deletebufline()
+  CheckDefAndScriptFailure2(['deletebufline([], 2)'], 'E1013: Argument 1: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['deletebufline("a", [])'], 'E1013: Argument 2: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['deletebufline("a", 2, 0z10)'], 'E1013: Argument 3: type mismatch, expected string but got blob', 'E1174: String required for argument 3')
+enddef
+
 def Test_diff_filler()
   CheckDefFailure(['diff_filler([])'], 'E1013: Argument 1: type mismatch, expected string but got list<unknown>')
   CheckDefFailure(['diff_filler(true)'], 'E1013: Argument 1: type mismatch, expected string but got bool')
@@ -670,6 +750,9 @@ def Test_expand()
   split SomeFile
   expand('%', true, true)->assert_equal(['SomeFile'])
   close
+  CheckDefAndScriptFailure2(['expand(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['expand("a", 2)'], 'E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2')
+  CheckDefAndScriptFailure2(['expand("a", true, 2)'], 'E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3')
 enddef
 
 def Test_expandcmd()
@@ -858,6 +941,8 @@ def Test_flattennew()
       echo flatten([1, 2, 3])
   END
   CheckDefAndScriptFailure(lines, 'E1158:')
+  CheckDefAndScriptFailure2(['flattennew({})'], 'E1013: Argument 1: type mismatch, expected list<any> but got dict<unknown>', 'E1211: List required for argument 1')
+  CheckDefAndScriptFailure2(['flattennew([], "1")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
 enddef
 
 " Test for float functions argument type
@@ -1033,6 +1118,9 @@ def Test_getbufline()
   getbufline(-1, 1, '$')->assert_equal([])
 
   bwipe!
+  CheckDefAndScriptFailure2(['getbufline([], 2)'], 'E1013: Argument 1: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['getbufline("a", [])'], 'E1013: Argument 2: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['getbufline("a", 2, 0z10)'], 'E1013: Argument 3: type mismatch, expected string but got blob', 'E1174: String required for argument 3')
 enddef
 
 def Test_getchangelist()
@@ -1062,24 +1150,14 @@ def Test_getcharstr()
   CheckDefAndScriptFailure2(['getcharstr("1")'], 'E1013: Argument 1: type mismatch, expected bool but got string', 'E1135: Using a String as a Bool')
 enddef
 
-def Test_getenv()
-  if getenv('does-not_exist') == ''
-    assert_report('getenv() should return null')
-  endif
-  if getenv('does-not_exist') == null
-  else
-    assert_report('getenv() should return null')
-  endif
-  $SOMEENVVAR = 'some'
-  assert_equal('some', getenv('SOMEENVVAR'))
-  unlet $SOMEENVVAR
-enddef
-
 def Test_getcompletion()
   set wildignore=*.vim,*~
   var l = getcompletion('run', 'file', true)
   l->assert_equal([])
   set wildignore&
+  CheckDefAndScriptFailure2(['getcompletion(1, "b")'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['getcompletion("a", 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['getcompletion("a", "b", 2)'], 'E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3')
 enddef
 
 def Test_getcurpos()
@@ -1096,6 +1174,19 @@ def Test_getcwd()
   CheckDefFailure(['getcwd(1, "x")'], 'E1013: Argument 2: type mismatch, expected number but got string')
 enddef
 
+def Test_getenv()
+  if getenv('does-not_exist') == ''
+    assert_report('getenv() should return null')
+  endif
+  if getenv('does-not_exist') == null
+  else
+    assert_report('getenv() should return null')
+  endif
+  $SOMEENVVAR = 'some'
+  assert_equal('some', getenv('SOMEENVVAR'))
+  unlet $SOMEENVVAR
+enddef
+
 def Test_getfontname()
   CheckDefFailure(['getfontname(10)'], 'E1013: Argument 1: type mismatch, expected string but got number')
 enddef
@@ -1204,6 +1295,9 @@ def Test_getreg()
   setreg('a', lines)
   getreg('a', true, true)->assert_equal(lines)
   assert_fails('getreg("ab")', 'E1162:')
+  CheckDefAndScriptFailure2(['getreg(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['getreg(".", 2)'], 'E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2')
+  CheckDefAndScriptFailure2(['getreg(".", 1, "b")'], 'E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3')
 enddef
 
 def Test_getreg_return_type()
@@ -1230,6 +1324,17 @@ def Test_gettabinfo()
   CheckDefFailure(['gettabinfo("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
 enddef
 
+def Test_gettabvar()
+  CheckDefAndScriptFailure2(['gettabvar("a", "b")'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['gettabvar(1, 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+enddef
+
+def Test_gettabwinvar()
+  CheckDefAndScriptFailure2(['gettabwinvar("a", 2, "c")'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['gettabwinvar(1, "b", "c", [])'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['gettabwinvar(1, 1, 3, {})'], 'E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3')
+enddef
+
 def Test_gettagstack()
   CheckDefFailure(['gettagstack("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
 enddef
@@ -1247,8 +1352,17 @@ def Test_getwinpos()
   CheckDefFailure(['getwinpos("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
 enddef
 
+def Test_getwinvar()
+  CheckDefAndScriptFailure2(['getwinvar("a", "b")'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['getwinvar(1, 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+enddef
+
 def Test_glob()
   glob('runtest.vim', true, true, true)->assert_equal(['runtest.vim'])
+  CheckDefAndScriptFailure2(['glob(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['glob("a", 2)'], 'E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2')
+  CheckDefAndScriptFailure2(['glob("a", 1, "b")'], 'E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3')
+  CheckDefAndScriptFailure2(['glob("a", 1, true, 2)'], 'E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4')
 enddef
 
 def Test_glob2regpat()
@@ -1258,10 +1372,17 @@ enddef
 
 def Test_globpath()
   globpath('.', 'runtest.vim', true, true, true)->assert_equal(['./runtest.vim'])
+  CheckDefAndScriptFailure2(['globpath(1, "b")'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['globpath("a", 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['globpath("a", "b", "c")'], 'E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3')
+  CheckDefAndScriptFailure2(['globpath("a", "b", true, "d")'], 'E1013: Argument 4: type mismatch, expected bool but got string', 'E1212: Bool required for argument 4')
+  CheckDefAndScriptFailure2(['globpath("a", "b", true, false, "e")'], 'E1013: Argument 5: type mismatch, expected bool but got string', 'E1212: Bool required for argument 5')
 enddef
 
 def Test_has()
   has('eval', true)->assert_equal(1)
+  CheckDefAndScriptFailure2(['has(["a"])'], 'E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['has("a", "b")'], 'E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2')
 enddef
 
 def Test_has_key()
@@ -1286,6 +1407,9 @@ def Test_hasmapto()
   iabbrev foo foobar
   hasmapto('foobar', 'i', true)->assert_equal(1)
   iunabbrev foo
+  CheckDefAndScriptFailure2(['hasmapto(1, "b")'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['hasmapto("a", 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['hasmapto("a", "b", 2)'], 'E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3')
 enddef
 
 def Test_histadd()
@@ -1330,6 +1454,9 @@ enddef
 
 def Test_index()
   index(['a', 'b', 'a', 'B'], 'b', 2, true)->assert_equal(3)
+  CheckDefAndScriptFailure2(['index("a", "a")'], 'E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1')
+  CheckDefAndScriptFailure2(['index([1], 1.1, "c")'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
+  CheckDefAndScriptFailure2(['index(0z1020, [1], 1, 2)'], 'E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4')
 enddef
 
 def Test_input()
@@ -1458,6 +1585,16 @@ def Test_job_info_return_type()
   endif
 enddef
 
+def Test_job_setoptions()
+  if !has('job')
+    CheckFeature job
+  else
+    CheckDefAndScriptFailure2(['job_setoptions(test_null_channel(), {})'], 'E1013: Argument 1: type mismatch, expected job but got channel', 'E1219: Job required for argument 1')
+    CheckDefAndScriptFailure2(['job_setoptions(test_null_job(), [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 2')
+    assert_equal('fail', job_status(test_null_job()))
+  endif
+enddef
+
 def Test_job_status()
   if !has('job')
     CheckFeature job
@@ -1467,6 +1604,20 @@ def Test_job_status()
   endif
 enddef
 
+def Test_job_stop()
+  if !has('job')
+    CheckFeature job
+  else
+    CheckDefAndScriptFailure2(['job_stop("a")'], 'E1013: Argument 1: type mismatch, expected job but got string', 'E1219: Job required for argument 1')
+    CheckDefAndScriptFailure2(['job_stop(test_null_job(), true)'], 'E1013: Argument 2: type mismatch, expected string but got bool', 'E1174: String required for argument 2')
+  endif
+enddef
+
+def Test_join()
+  CheckDefAndScriptFailure2(['join("abc")'], 'E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1')
+  CheckDefAndScriptFailure2(['join([], 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+enddef
+
 def Test_js_decode()
   CheckDefFailure(['js_decode(10)'], 'E1013: Argument 1: type mismatch, expected string but got number')
   assert_equal([1, 2], js_decode('[1,2]'))
@@ -1512,6 +1663,11 @@ def Test_list2str_str2list_utf8()
   list2str(l, true)->assert_equal(s)
 enddef
 
+def Test_list2str()
+  CheckDefAndScriptFailure2(['list2str(".", true)'], 'E1013: Argument 1: type mismatch, expected list<number> but got string', 'E1211: List required for argument 1')
+  CheckDefAndScriptFailure2(['list2str([1], 0z10)'], 'E1013: Argument 2: type mismatch, expected bool but got blob', 'E1212: Bool required for argument 2')
+enddef
+
 def SID(): number
   return expand('<SID>')
           ->matchstr('<SNR>\zs\d\+\ze_$')
@@ -1526,6 +1682,27 @@ def Test_listener_remove()
   CheckDefAndScriptFailure2(['listener_remove("x")'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1030: Using a String as a Number')
 enddef
 
+def Test_map_failure()
+  CheckFeature job
+
+  var lines =<< trim END
+      vim9script
+      writefile([], 'Xtmpfile')
+      silent e Xtmpfile
+      var d = {[bufnr('%')]: {a: 0}}
+      au BufReadPost * Func()
+      def Func()
+          if d->has_key('')
+          endif
+          eval d[expand('<abuf>')]->mapnew((_, v: dict<job>) => 0)
+      enddef
+      e
+  END
+  CheckScriptFailure(lines, 'E1013:')
+  au! BufReadPost
+  delete('Xtmpfile')
+enddef
+
 def Test_map_function_arg()
   var lines =<< trim END
       def MapOne(i: number, v: string): string
@@ -1591,12 +1768,10 @@ def Test_maparg()
         rhs: 'bar',
         buffer: 0})
   unmap foo
-enddef
+  CheckDefAndScriptFailure2(['maparg(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
-
+  CheckDefAndScriptFailure2(['maparg("a", 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
-def Test_mapcheck()
+  CheckDefAndScriptFailure2(['maparg("a", "b", 2)'], 'E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3')
-  iabbrev foo foobar
+  CheckDefAndScriptFailure2(['maparg("a", "b", true, 2)'], 'E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4')
-  mapcheck('foo', 'i', true)->assert_equal('foobar')
-  iunabbrev foo
 enddef
 
 def Test_maparg_mapset()
@@ -1607,25 +1782,19 @@ def Test_maparg_mapset()
   nunmap <F3>
 enddef
 
-def Test_map_failure()
+def Test_mapcheck()
-  CheckFeature job
+  iabbrev foo foobar
+  mapcheck('foo', 'i', true)->assert_equal('foobar')
+  iunabbrev foo
+  CheckDefAndScriptFailure2(['mapcheck(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['mapcheck("a", 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['mapcheck("a", "b", 2)'], 'E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3')
+enddef
 
-  var lines =<< trim END
+def Test_mapset()
-      vim9script
+  CheckDefAndScriptFailure2(['mapset(1, true, {})'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
-      writefile([], 'Xtmpfile')
+  CheckDefAndScriptFailure2(['mapset("a", 2, {})'], 'E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2')
-      silent e Xtmpfile
+  CheckDefAndScriptFailure2(['mapset("a", false, [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
-      var d = {[bufnr('%')]: {a: 0}}
-      au BufReadPost * Func()
-      def Func()
-          if d->has_key('')
-          endif
-          eval d[expand('<abuf>')]->mapnew((_, v: dict<job>) => 0)
-      enddef
-      e
-  END
-  CheckScriptFailure(lines, 'E1013:')
-  au! BufReadPost
-  delete('Xtmpfile')
 enddef
 
 def Test_match()
@@ -1668,6 +1837,18 @@ def Test_matchend()
   assert_equal(5, matchend(['a', 'b', 'c', 'b', 'd', 'b'], 'b', 2, 2))
 enddef
 
+def Test_matchfuzzy()
+  CheckDefAndScriptFailure2(['matchfuzzy({}, "p")'], 'E1013: Argument 1: type mismatch, expected list<any> but got dict<unknown>', 'E1211: List required for argument 1')
+  CheckDefAndScriptFailure2(['matchfuzzy([], 1)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['matchfuzzy([], "a", [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
+enddef
+
+def Test_matchfuzzypos()
+  CheckDefAndScriptFailure2(['matchfuzzypos({}, "p")'], 'E1013: Argument 1: type mismatch, expected list<any> but got dict<unknown>', 'E1211: List required for argument 1')
+  CheckDefAndScriptFailure2(['matchfuzzypos([], 1)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['matchfuzzypos([], "a", [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
+enddef
+
 def Test_matchlist()
   CheckDefAndScriptFailure2(['matchlist(0z12, "p")'], 'E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1')
   CheckDefAndScriptFailure2(['matchlist(["s"], [2])'], 'E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2')
@@ -1781,6 +1962,8 @@ enddef
 
 def Test_nr2char()
   nr2char(97, true)->assert_equal('a')
+  CheckDefAndScriptFailure2(['nr2char("x")'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['nr2char(1, "a")'], 'E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2')
 enddef
 
 def Test_or()
@@ -1906,9 +2089,22 @@ enddef
 def Test_prompt_setprompt()
   if !has('channel')
     CheckFeature channel
+  else
+    CheckDefAndScriptFailure2(['prompt_setprompt([], "p")'], 'E1013: Argument 1: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 1')
+    CheckDefAndScriptFailure2(['prompt_setprompt(1, [])'], 'E1013: Argument 2: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 2')
   endif
-  CheckDefAndScriptFailure2(['prompt_setprompt([], "p")'], 'E1013: Argument 1: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 1')
+enddef
-  CheckDefAndScriptFailure2(['prompt_setprompt(1, [])'], 'E1013: Argument 2: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 2')
+
+def Test_prop_add()
+  CheckDefAndScriptFailure2(['prop_add("a", 2, {})'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['prop_add(1, "b", {})'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['prop_add(1, 2, [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
+enddef
+
+def Test_prop_clear()
+  CheckDefAndScriptFailure2(['prop_clear("a")'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['prop_clear(1, "b")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['prop_clear(1, 2, [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
 enddef
 
 def Test_prop_find()
@@ -1922,6 +2118,12 @@ def Test_prop_list()
   CheckDefAndScriptFailure2(['prop_list(1, [])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 2')
 enddef
 
+def Test_prop_remove()
+  CheckDefAndScriptFailure2(['prop_remove([])'], 'E1013: Argument 1: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 1')
+  CheckDefAndScriptFailure2(['prop_remove({}, "a")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['prop_remove({}, 1, "b")'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
+enddef
+
 def Test_prop_type_add()
   CheckDefAndScriptFailure2(['prop_type_add({"a": 10}, "b")'], 'E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E731: Using a Dictionary as a String')
   CheckDefAndScriptFailure2(['prop_type_add("a", "b")'], 'E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E715: Dictionary required')
@@ -2053,6 +2255,15 @@ def Test_reltimestr()
   assert_true(type(reltimestr(reltime())) == v:t_string)
 enddef
 
+def Test_remote_expr()
+  CheckFeature clientserver
+  CheckEnv DISPLAY
+  CheckDefAndScriptFailure2(['remote_expr(1, "b")'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['remote_expr("a", 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['remote_expr("a", "b", 3)'], 'E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3')
+  CheckDefAndScriptFailure2(['remote_expr("a", "b", "c", "d")'], 'E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4')
+enddef
+
 def Test_remote_foreground()
   CheckFeature clientserver
   # remote_foreground() doesn't fail on MS-Windows
@@ -2077,6 +2288,14 @@ def Test_remote_read()
   CheckDefAndScriptFailure2(['remote_read("a", "x")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
 enddef
 
+def Test_remote_send()
+  CheckFeature clientserver
+  CheckEnv DISPLAY
+  CheckDefAndScriptFailure2(['remote_send(1, "b")'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['remote_send("a", 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['remote_send("a", "b", 3)'], 'E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3')
+enddef
+
 def Test_remote_startserver()
   CheckFeature clientserver
   CheckEnv DISPLAY
@@ -2089,6 +2308,31 @@ def Test_remove_const_list()
   assert_equal([3, 4], l)
 enddef
 
+def Test_remove()
+  CheckDefAndScriptFailure2(['remove("a", 1)'], 'E1013: Argument 1: type mismatch, expected list<any> but got string', 'E896: Argument of remove() must be a List, Dictionary or Blob')
+  CheckDefAndScriptFailure2(['remove([], "b")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['remove([], 1, "c")'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
+  CheckDefAndScriptFailure2(['remove({}, 1.1)'], 'E1013: Argument 2: type mismatch, expected string but got float', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['remove(0z10, "b")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['remove(0z20, 1, "c")'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
+  var l: any = [1, 2, 3, 4]
+  remove(l, 1)
+  assert_equal([1, 3, 4], l)
+  remove(l, 0, 1)
+  assert_equal([4], l)
+  var b: any = 0z1234.5678.90
+  remove(b, 1)
+  assert_equal(0z1256.7890, b)
+  remove(b, 1, 2)
+  assert_equal(0z1290, b)
+  var d: any = {a: 10, b: 20, c: 30}
+  remove(d, 'b')
+  assert_equal({a: 10, c: 30}, d)
+  var d2: any = {1: 'a', 2: 'b', 3: 'c'}
+  remove(d2, 2)
+  assert_equal({1: 'a', 3: 'c'}, d2)
+enddef
+
 def Test_remove_return_type()
   var l = remove({one: [1, 2], two: [3, 4]}, 'one')
   var res = 0
@@ -2202,6 +2446,13 @@ def Test_searchcount()
   CheckDefAndScriptFailure2(['searchcount([1])'], 'E1013: Argument 1: type mismatch, expected dict<any> but got list<number>', 'E715: Dictionary required')
 enddef
 
+def Test_searchdecl()
+  searchdecl('blah', true, true)->assert_equal(1)
+  CheckDefAndScriptFailure2(['searchdecl(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['searchdecl("a", 2)'], 'E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2')
+  CheckDefAndScriptFailure2(['searchdecl("a", true, 2)'], 'E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3')
+enddef
+
 def Test_searchpair()
   new
   setline(1, "here { and } there")
@@ -2247,6 +2498,11 @@ def Test_server2client()
   CheckDefAndScriptFailure2(['server2client("a", 10)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E573: Invalid server id used:')
 enddef
 
+def Test_shellescape()
+  CheckDefAndScriptFailure2(['shellescape(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['shellescape("a", 2)'], 'E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2')
+enddef
+
 def Test_set_get_bufline()
   # similar to Test_setbufline_getbufline()
   var lines =<< trim END
@@ -2297,10 +2553,6 @@ def Test_set_get_bufline()
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_searchdecl()
-  searchdecl('blah', true, true)->assert_equal(1)
-enddef
-
 def Test_setbufvar()
   setbufvar(bufnr('%'), '&syntax', 'vim')
   &syntax->assert_equal('vim')
@@ -2326,23 +2578,6 @@ def Test_setbufvar()
   getbufvar('%', 'myvar')->assert_equal(123)
 enddef
 
-def Test_setcharsearch()
-  CheckDefFailure(['setcharsearch("x")'], 'E1013: Argument 1: type mismatch, expected dict<any> but got string')
-  CheckDefFailure(['setcharsearch([])'], 'E1013: Argument 1: type mismatch, expected dict<any> but got list<unknown>')
-  var d: dict<any> = {char: 'x', forward: 1, until: 1}
-  setcharsearch(d)
-  assert_equal(d, getcharsearch())
-enddef
-
-def Test_setcmdpos()
-  CheckDefFailure(['setcmdpos("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
-enddef
-
-def Test_setfperm()
-  CheckDefFailure(['setfperm(1, "b")'], 'E1013: Argument 1: type mismatch, expected string but got number')
-  CheckDefFailure(['setfperm("a", 0z10)'], 'E1013: Argument 2: type mismatch, expected string but got blob')
-enddef
-
 def Test_setbufline()
   new
   var bnum = bufnr('%')
@@ -2364,6 +2599,35 @@ def Test_setcellwidths()
   CheckDefAndScriptFailure2(['setcellwidths({"a": 10})'], 'E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E714: List required')
 enddef
 
+def Test_setcharpos()
+  CheckDefAndScriptFailure2(['setcharpos(1, [])'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefFailure(['setcharpos(".", ["a"])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>')
+  CheckDefAndScriptFailure2(['setcharpos(".", 1)'], 'E1013: Argument 2: type mismatch, expected list<number> but got number', 'E1211: List required for argument 2')
+enddef
+
+def Test_setcharsearch()
+  CheckDefFailure(['setcharsearch("x")'], 'E1013: Argument 1: type mismatch, expected dict<any> but got string')
+  CheckDefFailure(['setcharsearch([])'], 'E1013: Argument 1: type mismatch, expected dict<any> but got list<unknown>')
+  var d: dict<any> = {char: 'x', forward: 1, until: 1}
+  setcharsearch(d)
+  assert_equal(d, getcharsearch())
+enddef
+
+def Test_setcmdpos()
+  CheckDefFailure(['setcmdpos("x")'], 'E1013: Argument 1: type mismatch, expected number but got string')
+enddef
+
+def Test_setcursorcharpos()
+  CheckDefAndScriptFailure2(['setcursorcharpos(0z10, 1)'], 'E1013: Argument 1: type mismatch, expected number but got blob', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['setcursorcharpos(1, "2")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['setcursorcharpos(1, 2, "3")'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
+enddef
+
+def Test_setfperm()
+  CheckDefFailure(['setfperm(1, "b")'], 'E1013: Argument 1: type mismatch, expected string but got number')
+  CheckDefFailure(['setfperm("a", 0z10)'], 'E1013: Argument 2: type mismatch, expected string but got blob')
+enddef
+
 def Test_setline()
   new
   setline(1, range(1, 4))
@@ -2383,6 +2647,27 @@ def Test_setloclist()
   var what = {items: items}
   setqflist([], ' ', what)
   setloclist(0, [], ' ', what)
+  CheckDefAndScriptFailure2(['setloclist("1", [])'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['setloclist(1, 2)'], 'E1013: Argument 2: type mismatch, expected list<any> but got number', 'E1211: List required for argument 2')
+  CheckDefAndScriptFailure2(['setloclist(1, [], 3)'], 'E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3')
+  CheckDefAndScriptFailure2(['setloclist(1, [], "a", [])'], 'E1013: Argument 4: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 4')
+enddef
+
+def Test_setmatches()
+  CheckDefAndScriptFailure2(['setmatches({})'], 'E1013: Argument 1: type mismatch, expected list<any> but got dict<unknown>', 'E1211: List required for argument 1')
+  CheckDefAndScriptFailure2(['setmatches([], "1")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+enddef
+
+def Test_setpos()
+  CheckDefAndScriptFailure2(['setpos(1, [])'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefFailure(['setpos(".", ["a"])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>')
+  CheckDefAndScriptFailure2(['setpos(".", 1)'], 'E1013: Argument 2: type mismatch, expected list<number> but got number', 'E1211: List required for argument 2')
+enddef
+
+def Test_setqflist()
+  CheckDefAndScriptFailure2(['setqflist(1, "")'], 'E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1211: List required for argument 1')
+  CheckDefAndScriptFailure2(['setqflist([], 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['setqflist([], "", [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
 enddef
 
 def Test_setreg()
@@ -2393,6 +2678,28 @@ def Test_setreg()
   assert_fails('setreg("ab", 0)', 'E1162:')
 enddef 
 
+def Test_settabvar()
+  CheckDefAndScriptFailure2(['settabvar("a", "b", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['settabvar(1, 2, "c")'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+enddef
+
+def Test_settabwinvar()
+  CheckDefAndScriptFailure2(['settabwinvar("a", 2, "c", true)'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['settabwinvar(1, "b", "c", [])'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['settabwinvar(1, 1, 3, {})'], 'E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3')
+enddef
+
+def Test_settagstack()
+  CheckDefAndScriptFailure2(['settagstack(true, {})'], 'E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['settagstack(1, [1])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2')
+  CheckDefAndScriptFailure2(['settagstack(1, {}, 2)'], 'E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3')
+enddef
+
+def Test_setwinvar()
+  CheckDefAndScriptFailure2(['setwinvar("a", "b", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['setwinvar(1, 2, "c")'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+enddef
+
 def Test_sha256()
   CheckDefFailure(['sha256(100)'], 'E1013: Argument 1: type mismatch, expected string but got number')
   CheckDefFailure(['sha256(0zABCD)'], 'E1013: Argument 1: type mismatch, expected string but got blob')
@@ -2414,6 +2721,12 @@ def Test_sign_getdefined()
   CheckDefAndScriptFailure2(['sign_getdefined(2)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
 enddef
 
+def Test_sign_getplaced()
+  CheckDefAndScriptFailure2(['sign_getplaced(["x"])'], 'E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['sign_getplaced(1, ["a"])'], 'E1013: Argument 2: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 2')
+  CheckDefAndScriptFailure2(['sign_getplaced("a", 1.1)'], 'E1013: Argument 2: type mismatch, expected dict<any> but got float', 'E1206: Dictionary required for argument 2')
+enddef
+
 def Test_sign_placelist()
   CheckDefAndScriptFailure2(['sign_placelist("x")'], 'E1013: Argument 1: type mismatch, expected list<any> but got string', 'E714: List required')
   CheckDefAndScriptFailure2(['sign_placelist({"a": 10})'], 'E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E714: List required')
@@ -2461,6 +2774,9 @@ def Test_slice()
   assert_equal(0z11, slice(0z001122334455, 1, -4))
   assert_equal(0z, slice(0z001122334455, 1, -5))
   assert_equal(0z, slice(0z001122334455, 1, -6))
+  CheckDefAndScriptFailure2(['slice({"a": 10}, 1)'], 'E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1211: List required for argument 1')
+  CheckDefAndScriptFailure2(['slice([1, 2, 3], "b")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['slice("abc", 1, "c")'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
 enddef
 
 def Test_spellsuggest()
@@ -2469,6 +2785,9 @@ def Test_spellsuggest()
   else
     spellsuggest('marrch', 1, true)->assert_equal(['March'])
   endif
+  CheckDefAndScriptFailure2(['spellsuggest(1)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['spellsuggest("a", "b")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['spellsuggest("a", 1, 0z01)'], 'E1013: Argument 3: type mismatch, expected bool but got blob', 'E1212: Bool required for argument 3')
 enddef
 
 def Test_sound_stop()
@@ -2508,6 +2827,9 @@ enddef
 
 def Test_split()
   split('  aa  bb  ', '\W\+', true)->assert_equal(['', 'aa', 'bb', ''])
+  CheckDefAndScriptFailure2(['split(1, "b")'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['split("a", 2)'], 'E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2')
+  CheckDefAndScriptFailure2(['split("a", "b", 2)'], 'E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3')
 enddef
 
 def Test_srand()
@@ -2557,6 +2879,13 @@ def Test_strcharlen()
   strcharlen(99)->assert_equal(2)
 enddef
 
+def Test_strcharpart()
+  CheckDefAndScriptFailure2(['strcharpart(1, 2)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['strcharpart("a", "b")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['strcharpart("a", 1, "c")'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
+  CheckDefAndScriptFailure2(['strcharpart("a", 1, 1, 2)'], 'E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4')
+enddef
+
 def Test_strchars()
   strchars("A\u20dd", true)->assert_equal(1)
   CheckDefAndScriptFailure2(['strchars(10)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
@@ -2593,6 +2922,13 @@ def Test_strlen()
   strlen(99)->assert_equal(2)
 enddef
 
+def Test_strpart()
+  CheckDefAndScriptFailure2(['strpart(1, 2)'], 'E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['strpart("a", "b")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['strpart("a", 1, "c")'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
+  CheckDefAndScriptFailure2(['strpart("a", 1, 1, 2)'], 'E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4')
+enddef
+
 def Test_strptime()
   CheckFunction strptime
   CheckDefFailure(['strptime(10, "2021")'], 'E1013: Argument 1: type mismatch, expected string but got number')
@@ -2626,6 +2962,8 @@ def Test_submatch()
   var actual = substitute('A123456789', pat, Rep, '')
   var expected = "[['A123456789'], ['1'], ['2'], ['3'], ['4'], ['5'], ['6'], ['7'], ['8'], ['9']]"
   actual->assert_equal(expected)
+  CheckDefAndScriptFailure2(['submatch("x")'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['submatch(1, "a")'], 'E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2')
 enddef
 
 def Test_substitute()
@@ -2653,6 +2991,9 @@ def Test_synID()
   setline(1, "text")
   synID(1, 1, true)->assert_equal(0)
   bwipe!
+  CheckDefAndScriptFailure2(['synID(0z10, 1, true)'], 'E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['synID("a", true, false)'], 'E1013: Argument 2: type mismatch, expected number but got bool', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['synID(1, 1, 2)'], 'E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3')
 enddef
 
 def Test_synIDtrans()
@@ -2753,6 +3094,8 @@ def Test_term_gettty()
     term_gettty(buf, true)->assert_notequal('')
     StopShellInTerminal(buf)
   endif
+  CheckDefAndScriptFailure2(['term_gettty([1])'], 'E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['term_gettty(1, 2)'], 'E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2')
 enddef
 
 def Test_term_sendkeys()
@@ -2761,6 +3104,12 @@ def Test_term_sendkeys()
   CheckDefAndScriptFailure2(['term_sendkeys(1, [])'], 'E1013: Argument 2: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 2')
 enddef
 
+def Test_term_setansicolors()
+  CheckRunVimInTerminal
+  CheckDefAndScriptFailure2(['term_setansicolors([], "p")'], 'E1013: Argument 1: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 1')
+  CheckDefAndScriptFailure2(['term_setansicolors(10, {})'], 'E1013: Argument 2: type mismatch, expected list<any> but got dict<unknown>', 'E1211: List required for argument 2')
+enddef
+
 def Test_term_setapi()
   CheckRunVimInTerminal
   CheckDefAndScriptFailure2(['term_setapi([], "p")'], 'E1013: Argument 1: type mismatch, expected string but got list<unknown>', 'E1174: String required for argument 1')
@@ -2811,6 +3160,15 @@ def Test_test_getvalue()
   CheckDefAndScriptFailure2(['test_getvalue(1.1)'], 'E1013: Argument 1: type mismatch, expected string but got float', 'E474: Invalid argument')
 enddef
 
+def Test_test_gui_mouse_event()
+  CheckGui
+  CheckDefAndScriptFailure2(['test_gui_mouse_event(1.1, 1, 1, 1, 1)'], 'E1013: Argument 1: type mismatch, expected number but got float', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['test_gui_mouse_event(1, "1", 1, 1, 1)'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['test_gui_mouse_event(1, 1, "1", 1, 1)'], 'E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3')
+  CheckDefAndScriptFailure2(['test_gui_mouse_event(1, 1, 1, "1", 1)'], 'E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4')
+  CheckDefAndScriptFailure2(['test_gui_mouse_event(1, 1, 1, 1, "1")'], 'E1013: Argument 5: type mismatch, expected number but got string', 'E1210: Number required for argument 5')
+enddef
+
 def Test_test_ignore_error()
   CheckDefAndScriptFailure2(['test_ignore_error([])'], 'E1013: Argument 1: type mismatch, expected string but got list<unknown>', 'E474: Invalid argument')
   test_ignore_error('RESET')
@@ -2845,6 +3203,11 @@ def Test_timer_info()
   assert_equal([], timer_info())
 enddef
 
+def Test_timer_pause()
+  CheckDefAndScriptFailure2(['timer_pause("x", 1)'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['timer_pause(1, "a")'], 'E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2')
+enddef
+
 def Test_timer_paused()
   var id = timer_start(50, () => 0)
   timer_pause(id, true)
@@ -2955,6 +3318,9 @@ def Test_win_splitmove()
   split
   win_splitmove(1, 2, {vertical: true, rightbelow: true})
   close
+  CheckDefAndScriptFailure2(['win_splitmove("a", 2)'], 'E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1')
+  CheckDefAndScriptFailure2(['win_splitmove(1, "b")'], 'E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2')
+  CheckDefAndScriptFailure2(['win_splitmove(1, 2, [])'], 'E1013: Argument 3: type mismatch, expected dict<any> but got list<unknown>', 'E1206: Dictionary required for argument 3')
 enddef
 
 def Test_winbufnr()

src/testing.c

@@ -1246,15 +1246,12 @@ f_test_gui_mouse_event(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
     int		repeated_click;
     int_u	mods;
 
-    if (argvars[0].v_type != VAR_NUMBER
+    if (check_for_number_arg(argvars, 0) == FAIL
-	    || (argvars[1].v_type) != VAR_NUMBER
+	    || check_for_number_arg(argvars, 1) == FAIL
-	    || (argvars[2].v_type) != VAR_NUMBER
+	    || check_for_number_arg(argvars, 2) == FAIL
-	    || (argvars[3].v_type) != VAR_NUMBER
+	    || check_for_number_arg(argvars, 3) == FAIL
-	    || (argvars[4].v_type) != VAR_NUMBER)
+	    || check_for_number_arg(argvars, 4) == FAIL)
-    {
-	emsg(_(e_invarg));
 	return;
-    }
 
     button = tv_get_number(&argvars[0]);
     row = tv_get_number(&argvars[1]);

src/textprop.c

@@ -158,6 +158,12 @@ f_prop_add(typval_T *argvars, typval_T *rettv UNUSED)
     linenr_T	start_lnum;
     colnr_T	start_col;
 
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_dict_arg(argvars, 2) == FAIL))
+	return;
+
     start_lnum = tv_get_number(&argvars[0]);
     start_col = tv_get_number(&argvars[1]);
     if (start_col < 1)
@@ -532,12 +538,21 @@ text_prop_type_by_id(buf_T *buf, int id)
     void
 f_prop_clear(typval_T *argvars, typval_T *rettv UNUSED)
 {
-    linenr_T start = tv_get_number(&argvars[0]);
+    linenr_T start;
-    linenr_T end = start;
+    linenr_T end;
     linenr_T lnum;
     buf_T    *buf = curbuf;
     int	    did_clear = FALSE;
 
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_opt_number_arg(argvars, 1) == FAIL
+		|| (argvars[1].v_type != VAR_UNKNOWN
+		    && check_for_opt_dict_arg(argvars, 2) == FAIL)))
+	return;
+
+    start = tv_get_number(&argvars[0]);
+    end = start;
     if (argvars[1].v_type != VAR_UNKNOWN)
     {
 	end = tv_get_number(&argvars[1]);
@@ -774,8 +789,7 @@ f_prop_list(typval_T *argvars, typval_T *rettv)
 
     if (in_vim9script()
 	    && (check_for_number_arg(argvars, 0) == FAIL
-		|| (argvars[1].v_type != VAR_UNKNOWN &&
+		|| check_for_opt_dict_arg(argvars, 1) == FAIL))
-		    check_for_dict_arg(argvars, 1) == FAIL)))
 	return;
 
     lnum = tv_get_number(&argvars[0]);
@@ -832,6 +846,14 @@ f_prop_remove(typval_T *argvars, typval_T *rettv)
     int		both;
 
     rettv->vval.v_number = 0;
+
+    if (in_vim9script()
+	    && (check_for_dict_arg(argvars, 0) == FAIL
+		|| check_for_opt_number_arg(argvars, 1) == FAIL
+		|| (argvars[1].v_type != VAR_UNKNOWN
+		    && check_for_opt_number_arg(argvars, 2) == FAIL)))
+	return;
+
     if (argvars[0].v_type != VAR_DICT || argvars[0].vval.v_dict == NULL)
     {
 	emsg(_(e_invarg));

src/time.c

@@ -270,8 +270,7 @@ f_strftime(typval_T *argvars, typval_T *rettv)
 
     if (in_vim9script()
 	    && (check_for_string_arg(argvars, 0) == FAIL
-		|| (argvars[1].v_type != VAR_UNKNOWN
+		|| check_for_opt_number_arg(argvars, 1) == FAIL))
-		    && check_for_number_arg(argvars, 1) == FAIL)))
 	return;
 
     rettv->v_type = VAR_STRING;
@@ -777,12 +776,17 @@ f_timer_info(typval_T *argvars, typval_T *rettv)
 f_timer_pause(typval_T *argvars, typval_T *rettv UNUSED)
 {
     timer_T	*timer = NULL;
-    int		paused = (int)tv_get_bool(&argvars[1]);
+
+    if (in_vim9script()
+	    && (check_for_number_arg(argvars, 0) == FAIL
+		|| check_for_bool_arg(argvars, 1) == FAIL))
+	return;
 
     if (argvars[0].v_type != VAR_NUMBER)
 	emsg(_(e_number_exp));
     else
     {
+	int	paused = (int)tv_get_bool(&argvars[1]);
 	timer = find_timer((int)tv_get_number(&argvars[0]));
 	if (timer != NULL)
 	    timer->tr_paused = paused;

src/typval.c

@@ -384,6 +384,16 @@ check_for_nonempty_string_arg(typval_T *args, int idx)
     return OK;
 }
 
+/*
+ * Check for an optional string argument at 'idx'
+ */
+    int
+check_for_opt_string_arg(typval_T *args, int idx)
+{
+    return (args[idx].v_type == VAR_UNKNOWN
+	    || check_for_string_arg(args, idx) != FAIL);
+}
+
 /*
  * Give an error and return FAIL unless "args[idx]" is a number.
  */
@@ -401,6 +411,16 @@ check_for_number_arg(typval_T *args, int idx)
     return OK;
 }
 
+/*
+ * Check for an optional number argument at 'idx'
+ */
+    int
+check_for_opt_number_arg(typval_T *args, int idx)
+{
+    return (args[idx].v_type == VAR_UNKNOWN
+	    || check_for_number_arg(args, idx) != FAIL);
+}
+
 /*
  * Give an error and return FAIL unless "args[idx]" is a bool.
  */
@@ -421,6 +441,16 @@ check_for_bool_arg(typval_T *args, int idx)
     return OK;
 }
 
+/*
+ * Check for an optional bool argument at 'idx'
+ */
+    int
+check_for_opt_bool_arg(typval_T *args, int idx)
+{
+    return (args[idx].v_type == VAR_UNKNOWN
+	    || check_for_bool_arg(args, idx) != FAIL);
+}
+
 /*
  * Give an error and return FAIL unless "args[idx]" is a list.
  */
@@ -438,6 +468,16 @@ check_for_list_arg(typval_T *args, int idx)
     return OK;
 }
 
+/*
+ * Check for an optional list argument at 'idx'
+ */
+    int
+check_for_opt_list_arg(typval_T *args, int idx)
+{
+    return (args[idx].v_type == VAR_UNKNOWN
+	    || check_for_list_arg(args, idx) != FAIL);
+}
+
 /*
  * Give an error and return FAIL unless "args[idx]" is a dict.
  */
@@ -455,6 +495,169 @@ check_for_dict_arg(typval_T *args, int idx)
     return OK;
 }
 
+/*
+ * Check for an optional dict argument at 'idx'
+ */
+    int
+check_for_opt_dict_arg(typval_T *args, int idx)
+{
+    return (args[idx].v_type == VAR_UNKNOWN
+	    || check_for_dict_arg(args, idx) != FAIL);
+}
+
+/*
+ * Give an error and return FAIL unless "args[idx]" is a blob.
+ */
+    int
+check_for_blob_arg(typval_T *args, int idx)
+{
+    if (args[idx].v_type != VAR_BLOB)
+    {
+	if (idx >= 0)
+	    semsg(_(e_blob_required_for_argument_nr), idx + 1);
+	else
+	    emsg(_(e_blobreq));
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Give an error and return FAIL unless "args[idx]" is a channel or a job.
+ */
+    int
+check_for_chan_or_job_arg(typval_T *args, int idx)
+{
+    if (args[idx].v_type != VAR_CHANNEL && args[idx].v_type != VAR_JOB)
+    {
+	if (idx >= 0)
+	    semsg(_(e_chan_or_job_required_for_argument_nr), idx + 1);
+	else
+	    emsg(_(e_chan_or_job_req));
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Give an error and return FAIL unless "args[idx]" is a job.
+ */
+    int
+check_for_job_arg(typval_T *args, int idx)
+{
+    if (args[idx].v_type != VAR_JOB)
+    {
+	if (idx >= 0)
+	    semsg(_(e_job_required_for_argument_nr), idx + 1);
+	else
+	    emsg(_(e_jobreq));
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Give an error and return FAIL unless "args[idx]" is a string or
+ * a number.
+ */
+    int
+check_for_string_or_number_arg(typval_T *args, int idx)
+{
+    if (args[idx].v_type != VAR_STRING && args[idx].v_type != VAR_NUMBER)
+    {
+	if (idx >= 0)
+	    semsg(_(e_string_required_for_argument_nr), idx + 1);
+	else
+	    emsg(_(e_stringreq));
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Give an error and return FAIL unless "args[idx]" is a string or
+ * a number (buffer)
+ */
+    int
+check_for_buffer_arg(typval_T *args, int idx)
+{
+    if (args[idx].v_type != VAR_STRING && args[idx].v_type != VAR_NUMBER)
+    {
+	if (idx >= 0)
+	    semsg(_(e_string_required_for_argument_nr), idx + 1);
+	else
+	    emsg(_(e_stringreq));
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Give an error and return FAIL unless "args[idx]" is a string or
+ * a number (line)
+ */
+    int
+check_for_lnum_arg(typval_T *args, int idx)
+{
+    if (args[idx].v_type != VAR_STRING && args[idx].v_type != VAR_NUMBER)
+    {
+	if (idx >= 0)
+	    semsg(_(e_string_required_for_argument_nr), idx + 1);
+	else
+	    emsg(_(e_stringreq));
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Give an error and return FAIL unless "args[idx]" is a string or
+ * a number (line)
+ */
+    int
+check_for_opt_lnum_arg(typval_T *args, int idx)
+{
+    if (args[idx].v_type != VAR_UNKNOWN
+	    && args[idx].v_type != VAR_STRING
+	    && args[idx].v_type != VAR_NUMBER)
+    {
+	if (idx >= 0)
+	    semsg(_(e_string_required_for_argument_nr), idx + 1);
+	else
+	    emsg(_(e_stringreq));
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Check for an optional string or number argument at 'idx'
+ */
+    int
+check_for_opt_string_or_number_arg(typval_T *args, int idx)
+{
+    return (args[idx].v_type == VAR_UNKNOWN
+	    || check_for_string_or_number_arg(args, idx) != FAIL);
+}
+
+/*
+ * Give an error and return FAIL unless "args[idx]" is a string or
+ * a blob.
+ */
+    int
+check_for_string_or_blob_arg(typval_T *args, int idx)
+{
+    if (args[idx].v_type != VAR_STRING && args[idx].v_type != VAR_BLOB)
+    {
+	if (idx >= 0)
+	    semsg(_(e_string_required_for_argument_nr), idx + 1);
+	else
+	    emsg(_(e_stringreq));
+	return FAIL;
+    }
+    return OK;
+}
+
 /*
  * Get the string value of a variable.
  * If it is a Number variable, the number is converted into a string.

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3188,
 /**/
     3187,
 /**/