cppwinrt/test/test_component_folders/test_component_folders.idl

import "Windows.Foundation.idl";

namespace test_component_folders
{
    runtimeclass Class
    {
        Class();

        void Method();
    }

    namespace Nested
    {
        runtimeclass NestedClass
        {
            NestedClass();

            void Method();
        }
    }
}