C++: Handle ProxyClass in getIdentityString()

cpp/ql/test/library-tests/identity_string/identity_string.cpp

@@ -9,6 +9,12 @@ void check_var(TVar var, const char* expected);
 
 struct S
 {
+  enum NestedEnum
+  {
+    Blah,
+    Bluh
+  };
+
   int i;
   float f;
 };
@@ -18,6 +24,13 @@ struct T
   bool b;
 };
 
+enum E
+{
+  One,
+  Two,
+  Three
+};
+
 void checks()
 {
   // Primitive types
@@ -120,6 +133,9 @@ void checks()
   check_type<AI>("int[10]");
   check_type<CAI>("int const[10]");
   check_type<int const[10]>("int const[10]");
+
+  check_type<E>("E");
+  check_type<S::NestedEnum>("S::NestedEnum");
 }
 
 int globalVariable;