[Bug c++/104470] internal compiler error: Segmentation fault compiling std::variant with -std=c++20

[max.kanold@nu-cost.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104470

Max <max.kanold@nu-cost.com> changed:

           What    |Removed                     |Added
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                 CC|                            |max.kanold@nu-cost.com

--- Comment #4 from Max <max.kanold@nu-cost.com> ---
Not sure whether it helps, but here is a version of the same ICE without the
struct having a member, see https://godbolt.org/z/4xjbcToxj

================================
#include <variant>

template<typename T>
struct A {};

template<typename T>
using Var = std::variant<A<T>>;

int main() {
    auto var = Var{};
}
================================

Here the compiler can clearly not deduce the type, so this is invalid code.
Adding the type leads to valid code which is compiled as expected.