[libcxx-commits] [libcxx] [libc++] Ensure that `std::expected` has no tail padding (PR #69673)

[Richard Smith via libcxx-commits]

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zygoloid wrote:

We could consider adding a Clang extension to support this case, to avoid the ABI change here and maintain the compact layout. Would that be useful to libc++, or would you need (at least) for GCC to implement the same extension before you could make use of it?

https://github.com/llvm/llvm-project/pull/69673