Sorry, I didn't have time on the weekdays. But I have time today.

@philnik , Okay, I'll deal with that tomorrow.

removed unneeded _LIBCPP_HIDE_FROM_ABI

The tests passed and I added more reviewers to this patch.

I think I fixed the CI when I revert the commit: https://github.com/llvm/llvm-project/commit/24416d22bb284cf24335ee7aa63131e5de56a1bb

I'm going to revert this commit.

Ok, I think current CI failures are not your fault.

add static_assert(!HasSpaceship<std::pair<int, int>, std::pair<std::string, int>>);

I've created https://github.com/llvm/llvm-project/issues/61254

What do you mean?

fix a test

add _LIBCPP_HIDE_FROM_ABI

change a compile.fail test to a verify test

add a test

inline variables is a c++17 feature

I think you should add ranges new beetween these two lines: https://github.com/llvm/llvm-project/blob/fac4c476b97b9f2a9dace059f084696d856c033b/libcxx/test/libcxx/transitive_includes/cxx03.csv#L647-L648 and https://github.com/llvm/llvm-project/blob/main/libcxx/test/libcxx/transitive_includes/cxx11.csv#L648-L649

fix formatting conflicts in libcxx/include/utility

I rebased and added tests to pair's spaceship operator.

I landed https://github.com/llvm/llvm-project/commit/a8ead9194cfb18922408404c8cabfa83c276944f but I forgot to add

Microsoft STL treats this paper as a DR and I agree with Casey Carter that the code breakage will be minimal because the move_iterators are still input iterators in C++20.

restore const char in test\libcxx\memory\trivial_abi\unique_ptr_destruction_order.pass.cpp

fix more tests

fix tests

Thanks @philnik , I found the warning: -Wdeprecated-copy-with-user-provided-dtor: https://godbolt.org/z/rr186sGYK