CaseyCarter/cmcstl2

[myd7349]

https://github.com/CaseyCarter/cmcstl2
microsoft/vcpkg#7268

[tocic]

Currently the 3 major compilers provide a standard implementation of P0896R4, so the only advantage of that library I can think of is C++17 support. The same is for #784 (C++14). I suggest to close this issue.