[Bug libstdc++/121476] New: std::clamp is marked nodiscard, but std::ranges::clamp is not

[ville.voutilainen at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121476

            Bug ID: 121476
           Summary: std::clamp is marked nodiscard, but std::ranges::clamp
                    is not
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ville.voutilainen at gmail dot com
  Target Milestone: ---

We (reasonably, correctly) mark std::clamp [[nodiscard]], but don't do the same
thing for the ranges-cpo's function call operator. That operator should also be
marked [[nodiscard]]

See

https://github.com/gcc-mirror/gcc/blob/435e09e05c3750cad153c3c6e83134803c22c7f6/libstdc%2B%2B-v3/include/bits/stl_algo.h#L3634

and

https://github.com/gcc-mirror/gcc/blob/435e09e05c3750cad153c3c6e83134803c22c7f6/libstdc%2B%2B-v3/include/bits/ranges_algo.h#L4232