int testNumber = 3;

auto testBlock = [testNumber]() -> concurrency::task<void> {
    auto picker = ref new Windows::Storage::Pickers::FileOpenPicker();
    picker->FileTypeFilter->Append("*");

    {
        std::wstringstream stream;
        stream << "Before: " << testNumber << "\n";
        OutputDebugString(stream.str().c_str());
    }

    co_await picker->PickSingleFileAsync();

    {
        std::wstringstream stream;
        stream << "After: " << testNumber << "\n";
        OutputDebugString(stream.str().c_str());
    }
};
testBlock();