How to use std::array's data and other member functions in a constexpr context?

Question

I defined the following class, expecting to be able to use std::array in a constexpr context, but calling the data function results in a compilation error.

#include <array>
#include <cstddef>

template <std::size_t N>
struct ConstexprString
{
    consteval ConstexprString(const char(&_str)[N])
        : char_array(std::to_array(_str))
    {
    }

    consteval auto Data() const -> const char*
    {
        return char_array.data();
    }

private:
    const std::array<char, N> char_array;
};

int main() 
{
    constexpr ConstexprString csexpr_str("123\\0");
    constexpr auto d = csexpr_str.Data();
}

Report compile error on MSVC

constexpr auto d = csexpr_str.Data();
// error C2131: expression did not evaluate to a constant

Answer 1

csexpr_str is a local variable with non-static duration. Make it static, and GCC is happy to use it as an argument to consteval functions:

int main()
{
    static constexpr ConstexprString csexpr_str("123\\0");
    constexpr auto d = csexpr_str.Data();
}

Unless MSVC is badly broken, it should be happy too.