Bug 20701 – extern(C++, class|struct) should not apply to inner types

Consider the following code, compiled with DMD 2.091.0 on Windows x64: ``` extern(C++): extern(C++, class) struct Container { struct Inner { int val; } } void foo (const ref Container.Inner); pragma(msg, foo.mangleof); ``` This will output: `?foo@@YAXABVInner@Container@@@Z` which demangles to `void __cdecl foo(class Container::Inner const &)`. However, `Inner` is not a class, it is a `struct`, and having a similar declaration in C++ will lead to mangling errors.

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