test: add test for rust-langGH-422

GitHub issue 422 was fixed but needs a test.
rust-lang#422

Signed-off-by: Amanjeev Sethi <[email protected]>

Author: amanjeev

tests/expectations/tests/inner-typedef-gh422.rs

@@ -0,0 +1,11 @@
+template <typename T>
+class Foo {
+public:
+    class InnerType {
+        T t;
+    };
+};
+
+typedef Foo<int>::InnerType Bar;
+
+Bar func();