[libcxx-commits] [libcxx] [libc++][ranges] Applied `[[nodiscard]]` to `all`, `owning_view`, `ref_view` (PR #173708)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

I'm not sure whether the PR title should say `all`. The `operator()`s of `views::all` were marked `[[nodiscard]]` when initially implemented.

https://github.com/llvm/llvm-project/pull/173708