markused: fix veb actions

vlib/builtin/string.v

@@ -134,7 +134,7 @@ pub fn tos2(s &u8) string {
 // It will panic, when the pointer `s` is 0.
 // It is the same as `tos2`, but for &char pointers, avoiding callsite casts.
 // See also `tos_clone`.
-@[unsafe]
+@[markused; unsafe]
 pub fn tos3(s &char) string {
 	if s == 0 {
 		panic('tos3: nil string')
@@ -151,7 +151,7 @@ pub fn tos3(s &char) string {
 // It returns '', when given a 0 pointer `s`, it does NOT panic.
 // It is the same as `tos5`, but for &u8 pointers, avoiding callsite casts.
 // See also `tos_clone`.
-@[unsafe]
+@[markused; unsafe]
 pub fn tos4(s &u8) string {
 	if s == 0 {
 		return ''
@@ -168,7 +168,7 @@ pub fn tos4(s &u8) string {
 // It returns '', when given a 0 pointer `s`, it does NOT panic.
 // It is the same as `tos4`, but for &char pointers, avoiding callsite casts.
 // See also `tos_clone`.
-@[unsafe]
+@[markused; unsafe]
 pub fn tos5(s &char) string {
 	if s == 0 {
 		return ''

vlib/v/markused/markused.v

@@ -363,6 +363,7 @@ pub fn mark_used(mut table ast.Table, mut pref_ pref.Preferences, ast_files []&a
 	walker.mark_markused_globals() // tagged with `@[markused]`
 	walker.mark_exported_fns()
 	walker.mark_root_fns(all_fn_root_names)
+	walker.mark_veb_actions()
 
 	if walker.n_asserts > 0 {
 		unsafe { walker.fn_decl(mut all_fns['__print_assert_failure']) }

vlib/v/markused/walker.v

@@ -93,6 +93,19 @@ pub fn (mut w Walker) mark_root_fns(all_fn_root_names []string) {
 	}
 }
 
+pub fn (mut w Walker) mark_veb_actions() {
+	for _, mut func in w.all_fns {
+		if func.return_type == w.table.veb_res_idx_cache {
+			// if fn_name !in w.used_fns {
+			$if trace_skip_veb_actions ? {
+				println('>>>> walking veb action func: ${func.name} ...')
+			}
+			w.fn_decl(mut func)
+		}
+		//}
+	}
+}
+
 pub fn (mut w Walker) mark_exported_fns() {
 	for _, mut func in w.all_fns {
 		if func.is_exported {