[libcxx-commits] [libcxx] [libc++] Mark vector<bool>::at() as constexpr to conform to C++20 standard (PR #121848)

[Peng Liu via libcxx-commits]

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winner245 wrote:

Yeah, that's a bit strange. Following your suggestion, I've now strengthened the tests for `vector<bool>::at`, which now cover general functionality, return type, exception handling, and constexpr compliance for both the const and non-const overloads of the `at` function.

https://github.com/llvm/llvm-project/pull/121848