Add test for parameterized exprs with type params

Another part of #108 that already works without having to change
anything. Looks like ParameterizedException’s default walker order works
for us.

test-samples/higherTypes.ceylon

@@ -9,3 +9,6 @@ value namedArgsInvocWithFunctionArgWithTypeParam = f {
     }
 };
 value anonymousGenericFunction = <T>(T t) => t;
+class C() {
+    parameterizedExpressionWithTypeParams<T>(T t) => t;
+}