How to map enum wrapped in a struct #146

I am trying to map a series of enums which are declared and then used as follows:

namespace Lib {
    struct SomeEnumName {
        enum Enum {
            EUndefined,
            ...
        }
    }
    ...
    class SomeClass {
    public:
        SomeType* DoSomething(SomeEnumName::Enum value, ...) {
            ...
        }
    }
}

I am trying to map them like this:

<map enum="SomeEnumName::Enum" />

But I get these errors:

C:\Project\Mapping.xml(1,1): warning SG0019: Mapping rule [map enum:SomeEnumName::Enum] did not match any elements.
CppInterface [SomeClass]/Method SomeType* SomeClass::DoSomething([In] Enum type,[In] void* data) error : Unknown type found [Enum]

Are these enums represented in the C++ AST at all? How do I match on them such that first of all the method will be generated and second that some C# equivalent of the enumerations is created?

Next to that, the wrapping is usually in otherwise empty structs, probably because C++ enums are a broken concept as their constant members aren't scoped to the enum declaration. But it is silly to have enums be declared as nested in a struct, although it is valid C#. How do I match on them and change the C# such that these enums will be declared as SomeEnumName?