[libcxx-commits] [libcxx] [libc++] Fix UB in <expected> related to "has value" flag (#68552) (PR #68733)

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huixie90 wrote:

This is a simplified example.
https://godbolt.org/z/YGbG3PeYY

I don't think we can fix it. It is a mistake to use `[[no_unique_address]]` I think. I think there is no way to fix without breaking ABI now.

https://github.com/llvm/llvm-project/pull/68733