https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117454

--- Comment #4 from Darrell Wright <Darrell.Wright at gmail dot com> ---
#include <type_traits>

struct Base {
    using Type = int;
};

template <typename Type>
struct Derived : Base {
    Type field;
};

static_assert( std::is_same_v<decltype(Derived<double>{}.field), double> ); 

I think this should warn too, the intent is clear and the user hopefully gets a
conversion warning/error.

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