update test

Author: ludviggunne

test/cli/other_test.py

@@ -3164,6 +3164,15 @@ def test_check_unused_templates_func(tmp_path):  # #13714
     (void)(*((int*)0));
 }
 
+class S {
+public:
+    template<typename T>
+    void f_t_3()
+    {
+        (void)(*((int*)0));
+    }
+};
+
 void f() {}
 """)