[libcxx-commits] [libcxx] [libc++] mark `std::expected` as `nodiscard` (PR #130820)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne commented:

I'm conflicted about making this change -- I suspect this could end up being really verbose. Before we actually land this, can you please ping @llvm/libcxx-vendors to give folks a chance to run this change internally first? I'd like to try that out to get some signal.

https://github.com/llvm/llvm-project/pull/130820