C++: Test fun_decl for INVALID_KEYs

cpp/ql/test/library-tests/fun_decl/compile1.cpp

@@ -0,0 +1,7 @@
+#include "fwd.h"
+
+void func1()
+{
+	classA *a = create_an_a();
+}
+

cpp/ql/test/library-tests/fun_decl/compile2.cpp

@@ -0,0 +1,15 @@
+#include "fwd.h"
+
+class classA {
+public:
+	~classA() {	}
+};
+
+classA *create_an_a() {
+	return new classA;
+}
+
+void func2()
+{
+	classA *a = create_an_a();
+}

cpp/ql/test/library-tests/fun_decl/fwd.h

@@ -0,0 +1,3 @@
+class classA;
+classA *create_an_a(); // permits creation of a classA while it is an incomplete type.
+typedef classA classA_typedef;

cpp/ql/test/library-tests/fun_decl/test.expected

@@ -0,0 +1,8 @@
+| compile1.cpp:3:6:3:10 | func1 |
+| compile2.cpp:3:7:3:7 | operator= |
+| compile2.cpp:5:2:5:8 | ~classA |
+| compile2.cpp:8:9:8:19 | create_an_a |
+| compile2.cpp:12:6:12:10 | func2 |
+| file://:0:0:0:0 | operator new |
+| file://:0:0:0:0 | operator= |
+| file://:0:0:0:0 | operator= |

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

@@ -0,0 +1,4 @@
+import cpp
+
+from Function f
+select f