[libcxx-commits] [libcxx] [libc++] Implement LWG4072: std::optional comparisons: constrain harder (PR #209968)

[A. Jiang via libcxx-commits]

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frederick-vs-ja wrote:

It's better to simplify this sentence (same for other test files). See:
- https://llvm.org/docs/CodingStandards.html#don-t-use-braces-on-simple-single-statement-bodies-of-if-else-loop-statements

```suggestion
  if constexpr (requires { t == u; })
    return t == u;
  else
    return {};
```

https://github.com/llvm/llvm-project/pull/209968