template-for (expansion statements)

[lefticus]

https://eel.is/c++draft/stmt.expand#def:expansion_statement,destructuring

Note that this works for both constexpr data and non-constexpr data

https://compiler-explorer.com/z/5Ysba3qP3

[lefticus]

https://isocpp.org/files/papers/P1306R5.html

[lefticus]

Release in ep503 https://youtu.be/yaWiGLSDc64