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Aren't you time-travelling? std::expected is C++23 (so available starting from 2025-2027 xd)

It has been available since GCC 12.1 (May 2022), Clang 19.1 (Sep 2024), and Visual Studio 17.13 (2022~): https://godbolt.org/z/on1v6qdf3

These days compiler developers implement accepted standard features pretty fast.

And tl::expected (a largely identical impl) has been available similarly as long!