[libcxx-commits] [libcxx] [libc++] Add missing CPO tests for range adaptors (PR #149557)

[A. Jiang via libcxx-commits]

https://github.com/frederick-vs-ja approved this pull request.

Thanks! I pushed some conflict-resolving changes.

It seems that `static_assert(test(std::views::repeat, 1));` wasn't guarded and compiled in C++20. Perhaps we can look into this later.

https://github.com/llvm/llvm-project/pull/149557