Add test for 14479

Author: ludviggunne

test/testunusedvar.cpp

@@ -154,6 +154,7 @@ class TestUnusedVar : public TestFixture {
         TEST_CASE(localvar69);
         TEST_CASE(localvar70);
         TEST_CASE(localvar71);
+        TEST_CASE(localvar72);
         TEST_CASE(localvarloops); // loops
         TEST_CASE(localvaralias1);
         TEST_CASE(localvaralias2); // ticket #1637
@@ -4046,6 +4047,15 @@ class TestUnusedVar : public TestFixture {
         ASSERT_EQUALS("", errout_str());
     }
 
+    void localvar72() {
+        functionVariableUsage("void f()\n"
+                              "{\n"
+                              "  struct S {};\n"
+                              "  int S::* mp;\n"
+                              "}\n");
+        ASSERT_EQUALS("[test.cpp:4:12]: (style) Unused variable: mp [unusedVariable]\n", errout_str());
+    }
+
     void localvarloops() {
         // loops
         functionVariableUsage("void fun(int c) {\n"