struct without constructors containing std::variant containing array cannot be returned by value?

In C++ I want to return a struct by value which contains a variant with an array inside. The struct has no explicit constructors. Is this not possible?

In the following I get the compiler error (gcc):

"error: use of deleted function 'TestStruct2::TestStruct2(const TestStruct2&)'"

It works, if I define constructors. I don't want constructors here.

struct TestStruct2
{
    std::variant<int[5], float[4]> t;
};

TestStruct2 test2()
{
    TestStruct2 t;
    return t;
}