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

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@@ -88,8 +88,353 @@ _LIBCPP_HIDE_FROM_ABI void __throw_bad_expected_access(_Arg&& __arg) {
 #  endif
 }
 
+struct __conditional_no_unique_address_invoke_tag {};
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huixie90 wrote:

could you please left a comment about why is this needed?
I am slightly confused with this tag and the `__expected_construct_in_place_from_invoke_tag`

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