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

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huixie90 wrote:

We need the padding otherwise 
‘std::expected<std::expected<std::optional<int>,E1>,E2>’ won’t work. The inner ‘expected’ would overwrite the outer ‘expected::has_value’

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